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  2. <p>湖北省黄冈市浠水县实验高级中学2019-2020学年高一数学上学期12月训练试题(含解析)</p>
  3. <p>一、选择题(本大题共12小题,共60.0分)</p>
  4. <p>1.设集合<img src="files/image1.png" width="151px" height="24px" data-latex="$$" />,<img src="files/image2.png" width="121px" height="21px" data-latex="$$" />,则<img src="files/image3.png" width="54px" height="20px" data-latex="$$" />( )</p>
  5. <p>A. <img src="files/image4.png" width="60px" height="41px" data-latex="$$" />B. <img src="files/image5.png" width="48px" height="41px" data-latex="$$" />C. <img src="files/image6.png" width="37px" height="41px" data-latex="$$" />D. <img src="files/image7.png" width="41px" height="41px" data-latex="$$" /></p>
  6. <p>【答案】D</p>
  7. <p>【解析】</p>
  8. <p>试题分析:集合<img src="files/image8.png" width="265px" height="29px" data-latex="$$" />,集合<img src="files/image9.png" width="96px" height="33.75pt" />,所以<img src="files/image10.png" width="151px" height="45px" data-latex="$$" />,故选D.</p>
  9. <p>考点:1、一元二次不等式;2、集合的运算.</p>
  10. <p> </p>
  11. <p> </p>
  12. <p>2.已知偶函数<img src="files/image11.png" width="39px" height="27px" data-latex="$$" />在区间<img src="files/image12.png" width="51px" height="27px" data-latex="$$" />上单调递增,则满足<img src="files/image13.png" width="117px" height="45px" data-latex="$$" />的<img src="files/image14.png" width="13px" height="15px" data-latex="$$" />的取值范围为()</p>
  13. <p>A. <img src="files/image15.png" width="44px" height="41px" data-latex="$$" />B. <img src="files/image16.png" width="43px" height="41px" data-latex="$$" />C. <img src="files/image17.png" width="44px" height="41px" data-latex="$$" />D. <img src="files/image18.png" width="44px" height="42px" data-latex="$$" /></p>
  14. <p>【答案】A</p>
  15. <p>【解析】</p>
  16. <p>【分析】</p>
  17. <p>根据单调性,将函数值的大小关系转变为自变量间的大小关系,注意偶函数对应的函数的对称情况.</p>
  18. <p>【详解】因为偶函数<img src="files/image11.png" width="39px" height="27px" data-latex="$$" />是在<img src="files/image12.png" width="51px" height="27px" data-latex="$$" />上递增,则<img src="files/image11.png" width="39px" height="27px" data-latex="$$" />在<img src="files/image19.png" width="51px" height="27px" data-latex="$$" />递减,且<img src="files/image20.png" width="103px" height="45px" data-latex="$$" />;又因为<img src="files/image13.png" width="117px" height="45px" data-latex="$$" />,根据单调性和奇偶性有:<img src="files/image21.png" width="101px" height="41px" data-latex="$$" />,解得:<img src="files/image22.png" width="72px" height="45px" data-latex="$$" />,</p>
  19. <p>故选A.</p>
  20. <p>【点睛】本题考查利用函数单调性、奇偶性求解参数范围问题,难度一般.对于这种奇偶性和单调性的综合问题,除了可以直接分析问题,还可以借助图象来分析,也可以高效解决问题.</p>
  21. <p> </p>
  22. <p> </p>
  23. <p>3. 若a>b>0,0<c<1,则</p>
  24. <p>A. log<sub>a</sub>c<log<sub>b</sub>cB. log<sub>c</sub>a<log<sub>c</sub>bC. a<sup>c</sup><b<sup>c </sup>D. c<sup>a</sup>>c<sup>b</sup></p>
  25. <p>【答案】B</p>
  26. <p>【解析】</p>
  27. <p>试题分析:对于选项A,<img src="files/image23.png" width="167px" height="44px" data-latex="$$" />,<img src="files/image24.png" width="69px" height="19px" data-latex="$$" />,<img src="files/image25.png" width="63px" height="21px" data-latex="$$" />,而<img src="files/image26.png" width="61px" height="19px" data-latex="$$" />,所以<img src="files/image27.png" width="67px" height="21px" data-latex="$$" />,但不能确定<img src="files/image28.png" width="57px" height="21px" data-latex="$$" />的正负,所以它们的大小不能确定;对于选项B,<img src="files/image29.png" width="169px" height="44px" data-latex="$$" />,<img src="files/image27.png" width="67px" height="21px" data-latex="$$" />,两边同乘以一个负数<img src="files/image30.png" width="29px" height="44px" data-latex="$$" />改变不等号方向,所以选项B正确;对于选项C,利用<img src="files/image31.png" width="44px" height="24px" data-latex="$$" />在第一象限内是增函数即可得到<img src="files/image32.png" width="48px" height="21px" data-latex="$$" />,所以C错误;对于选项D,利用<img src="files/image33.png" width="43px" height="24px" data-latex="$$" />在<img src="files/image34.png" width="16px" height="18px" data-latex="$$" />上为减函数易得<img src="files/image35.png" width="48px" height="21px" data-latex="$$" />,所以D错误.所以本题选B.</p>
  28. <p>【考点】指数函数与对数函数的性质</p>
  29. <p>【名师点睛】比较幂或对数值的大小,若幂的底数相同或对数的底数相同,通常利用指数函数或对数函数的单调性进行比较;若底数不同,可考虑利用中间量进行比较.</p>
  30. <p> </p>
  31. <p> </p>
  32. <p>4.若<img src="files/image14.png" width="13px" height="15px" data-latex="$$" />,<img src="files/image36.png" width="47px" height="24px" data-latex="$$" />,且<img src="files/image37.png" width="83px" height="21px" data-latex="$$" />,则<img src="files/image38.png" width="52px" height="21px" data-latex="$$" />的最小值是( )</p>
  33. <p>A. <img src="files/image39.png" width="12px" height="19px" data-latex="$$" />B. <img src="files/image40.png" width="24px" height="41px" data-latex="$$" />C. <img src="files/image41.png" width="35px" height="45px" data-latex="$$" />D. <img src="files/image42.png" width="21px" height="41px" data-latex="$$" /></p>
  34. <p>【答案】A</p>
  35. <p>【解析】</p>
  36. <p>从题设可得<img src="files/image43.png" width="77px" height="48px" data-latex="$$" />,则<img src="files/image44.png" width="416px" height="44px" data-latex="$$" />,应选答案A.</p>
  37. <p>5.设p:实数x,y满足x>1且y>1,q:实数x,y满足x+y>2,则p是q的(  )</p>
  38. <p>A. 充分不必要条件</p>
  39. <p>B. 必要不充分条件</p>
  40. <p>C. 充要条件</p>
  41. <p>D. 既不充分也不必要条件</p>
  42. <p>【答案】A</p>
  43. <p>【解析】</p>
  44. <p>【详解】“若<img src="files/image45.png" width="35px" height="19px" data-latex="$$" />且<img src="files/image46.png" width="32px" height="20px" data-latex="$$" />则<img src="files/image47.png" width="62px" height="21px" data-latex="$$" />”是真命题,其逆命题是假命题,故<img src="files/image48.png" width="15px" height="16px" data-latex="$$" />是<img src="files/image49.png" width="12px" height="19px" data-latex="$$" />的充分不必要条件,故选A.</p>
  45. <p>6.下列叙述正确的是(  )</p>
  46. <p>A. 若<img src="files/image50.png" width="52px" height="21px" data-latex="$$" />,则<img src="files/image51.png" width="37px" height="19px" data-latex="$$" /></p>
  47. <p>B. 若<img src="files/image52.png" width="52px" height="22px" data-latex="$$" />,则<img src="files/image53.png" width="33px" height="17px" data-latex="$$" /></p>
  48. <p>C. 若<img src="files/image54.png" width="37px" height="19px" data-latex="$$" />,则<img src="files/image55.png" width="52px" height="22px" data-latex="$$" /></p>
  49. <p>D. 若<img src="files/image50.png" width="52px" height="21px" data-latex="$$" />|,则<img src="files/image56.png" width="47px" height="19px" data-latex="$$" /></p>
  50. <p>【答案】D</p>
  51. <p>【解析】</p>
  52. <p>A. 令a=2,b=−2,此时<img src="files/image57.png" width="48px" height="27px" data-latex="$$" />,而a≠b,故本选项错误;</p>
  53. <p>B. 令a=−3,b=2,此时<img src="files/image58.png" width="48px" height="27px" data-latex="$$" />,而a&lt;b,故本选项错误;</p>
  54. <p>C. 令a=−3,b=2,此时<img src="files/image59.png" width="37px" height="19px" data-latex="$$" />,而<img src="files/image58.png" width="48px" height="27px" data-latex="$$" />,故本选项错误;</p>
  55. <p>D. 若<img src="files/image57.png" width="48px" height="27px" data-latex="$$" />,则<img src="files/image60.png" width="47px" height="19px" data-latex="$$" />,故本选项正确.</p>
  56. <p>故选D.</p>
  57. <p>7.设函数<img src="files/image61.png" width="151px" height="51px" data-latex="$$" />,则满足<img src="files/image62.png" width="60px" height="27px" data-latex="$$" />的x的取值范围是<img src="files/image63.png" width="11px" height="21px" data-latex="$$" />  <img src="files/image64.png" width="11px" height="21px" data-latex="$$" /></p>
  58. <p>A. <img src="files/image65.png" width="44px" height="27px" data-latex="$$" />B. <img src="files/image66.png" width="36px" height="27px" data-latex="$$" />C. <img src="files/image67.png" width="48px" height="27px" data-latex="$$" />D. <img src="files/image68.png" width="51px" height="27px" data-latex="$$" /></p>
  59. <p>【答案】D</p>
  60. <p>【解析】</p>
  61. <p>【分析】</p>
  62. <p>分类讨论:<img src="files/image69.png" width="21px" height="21px" data-latex="$$" />当<img src="files/image70.png" width="35px" height="17px" data-latex="$$" />时;<img src="files/image71.png" width="21px" height="21px" data-latex="$$" />当<img src="files/image72.png" width="35px" height="17px" data-latex="$$" />时,再按照指数不等式和对数不等式求解,最后求出它们的并集即可.</p>
  63. <p>【详解】当<img src="files/image70.png" width="35px" height="17px" data-latex="$$" />时,<img src="files/image73.png" width="53px" height="20px" data-latex="$$" />的可变形为<img src="files/image74.png" width="53px" height="17px" data-latex="$$" />,<img src="files/image75.png" width="37px" height="19px" data-latex="$$" />,<img src="files/image76.png" width="71px" height="19px" data-latex="$$" />.</p>
  64. <p>当<img src="files/image72.png" width="35px" height="17px" data-latex="$$" />时,<img src="files/image77.png" width="83px" height="24px" data-latex="$$" />的可变形为<img src="files/image78.png" width="40px" height="41px" data-latex="$$" />,<img src="files/image79.png" width="48px" height="17px" data-latex="$$" />,故答案为<img src="files/image68.png" width="51px" height="27px" data-latex="$$" />.</p>
  65. <p>故选D.</p>
  66. <p>【点睛】本题主要考查不等式的转化与求解,应该转化特定的不等式类型求解.</p>
  67. <p><img src="files/image80.png" width="10px" height="18px" data-latex="$$" />此处有视频,请去附件查看】</p>
  68. <p> </p>
  69. <p>8.当<img src="files/image81.png" width="42px" height="19px" data-latex="$$" />时,不等式<img src="files/image82.png" width="97px" height="21px" data-latex="$$" />恒成立,则k的取值范围是( )</p>
  70. <p>A. <img src="files/image83.png" width="49px" height="21px" data-latex="$$" />B. <img src="files/image12.png" width="51px" height="27px" data-latex="$$" />C. <img src="files/image84.png" width="37px" height="27px" data-latex="$$" />D. (0,4)</p>
  71. <p>【答案】C</p>
  72. <p>【解析】</p>
  73. <p>当<img src="files/image85.png" width="37px" height="19px" data-latex="$$" />时,不等式<img src="files/image86.png" width="97px" height="21px" data-latex="$$" />可化为<img src="files/image87.png" width="33px" height="19px" data-latex="$$" />,显然恒成立;当<img src="files/image88.png" width="37px" height="19px" data-latex="$$" />时,若不等式<img src="files/image86.png" width="97px" height="21px" data-latex="$$" />恒成立,则对应函数的图象开口朝上且与<img src="files/image14.png" width="13px" height="15px" data-latex="$$" />轴无交点,则<img src="files/image89.png" width="105px" height="48px" data-latex="$$" />解得:<img src="files/image90.png" width="62px" height="19px" data-latex="$$" />,综上<img src="files/image91.png" width="13px" height="19px" data-latex="$$" />的取值范围是<img src="files/image92.png" width="37px" height="27px" data-latex="$$" />,故选C.</p>
  74. <p>9.函数<img src="files/image93.png" width="148px" height="47px" data-latex="$$" />的定义域为<img src="files/image34.png" width="16px" height="18px" data-latex="$$" />,则实数<img src="files/image94.png" width="17px" height="15px" data-latex="$$" />的取值范围是(  )</p>
  75. <p>A. <img src="files/image95.png" width="39px" height="27px" data-latex="$$" />B. <img src="files/image84.png" width="37px" height="27px" data-latex="$$" />C. <img src="files/image96.png" width="37px" height="27px" data-latex="$$" />D. <img src="files/image97.png" width="37px" height="27px" data-latex="$$" /></p>
  76. <p>【答案】B</p>
  77. <p>【解析】</p>
  78. <p>【详解】试题分析:由题意可知<img src="files/image98.png" width="107px" height="21px" data-latex="$$" />恒成立,当<img src="files/image99.png" width="40px" height="19px" data-latex="$$" />时<img src="files/image100.png" width="33px" height="19px" data-latex="$$" />恒成立;当<img src="files/image101.png" width="41px" height="19px" data-latex="$$" />时需满足<img src="files/image102.png" width="49px" height="48px" data-latex="$$" />,代入解不等式可得<img src="files/image103.png" width="64px" height="19px" data-latex="$$" />,综上可知实数<img src="files/image94.png" width="17px" height="15px" data-latex="$$" />的取值范围是<img src="files/image84.png" width="37px" height="27px" data-latex="$$" /></p>
  79. <p>考点:函数定义域</p>
  80. <p>10.若函数<img src="files/image104.png" width="160px" height="42px" data-latex="$$" />有两个不同的极值点,则实数<img src="files/image105.png" width="13px" height="14px" data-latex="$$" />的取值范围是(  )</p>
  81. <p>A. <img src="files/image106.png" width="31px" height="17px" data-latex="$$" />B. <img src="files/image107.png" width="68px" height="19px" data-latex="$$" />C. <img src="files/image108.png" width="35px" height="19px" data-latex="$$" />D. <img src="files/image109.png" width="57px" height="19px" data-latex="$$" /></p>
  82. <p>【答案】D</p>
  83. <p>【解析】</p>
  84. <p>【分析】</p>
  85. <p>求出函数的导数,结合二次函数的性质得到关于a的不等式组,解出即可.</p>
  86. <p>【详解】<img src="files/image11.png" width="39px" height="27px" data-latex="$$" />的定义域是(0,+∞),</p>
  87. <p><img src="files/image110.png" width="200px" height="44px" data-latex="$$" />,</p>
  88. <p>若函数<img src="files/image11.png" width="39px" height="27px" data-latex="$$" />有两个不同的极值点,</p>
  89. <p>则<img src="files/image111.png" width="122px" height="27px" data-latex="$$" />在(0,+∞)由2个不同的实数根,</p>
  90. <p>故<img src="files/image112.png" width="141px" height="72px" data-latex="$$" />,解得:<img src="files/image109.png" width="57px" height="19px" data-latex="$$" />,</p>
  91. <p>故选D.</p>
  92. <p>【点睛】本题考查了函数的极值问题,考查导数的应用以及二次函数的性质,是一道中档题.</p>
  93. <p>11.若<img src="files/image113.png" width="80px" height="41px" data-latex="$$" />,且<img src="files/image114.png" width="16px" height="15px" data-latex="$$" />为第四象限角,则<img src="files/image115.png" width="39px" height="17px" data-latex="$$" />的值等于( )</p>
  94. <p>A. <img src="files/image116.png" width="21px" height="41px" data-latex="$$" />B. <img src="files/image117.png" width="33px" height="41px" data-latex="$$" />C. <img src="files/image118.png" width="21px" height="41px" data-latex="$$" />D. <img src="files/image119.png" width="33px" height="41px" data-latex="$$" /></p>
  95. <p>【答案】D</p>
  96. <p>【解析】</p>
  97. <p>∵sina=<img src="files/image120.png" width="32px" height="41px" data-latex="$$" />,且a为第四象限角,</p>
  98. <p>∴<img src="files/image121.png" width="148px" height="41px" data-latex="$$" />,</p>
  99. <p>则<img src="files/image122.png" width="125px" height="41px" data-latex="$$" />,</p>
  100. <p>故选D.</p>
  101. <p> </p>
  102. <p> </p>
  103. <p>12.已知函数<img src="files/image123.png" width="185px" height="48px" data-latex="$$" />,若函数<img src="files/image124.png" width="93px" height="29px" data-latex="$$" />有三个零点,则实数<img src="files/image91.png" width="13px" height="19px" data-latex="$$" />的取值范围是( )</p>
  104. <p>A. <img src="files/image125.png" width="47px" height="19px" data-latex="$$" />B. <img src="files/image126.png" width="68px" height="19px" data-latex="$$" />C. <img src="files/image127.png" width="79px" height="19px" data-latex="$$" />D. <img src="files/image128.png" width="45px" height="19px" data-latex="$$" /></p>
  105. <p>【答案】D</p>
  106. <p>【解析】</p>
  107. <p>【详解】由<img src="files/image129.png" width="89px" height="27px" data-latex="$$" />=0得|f(x)|=-k≥0,</p>
  108. <p>所以k≤0,作出函数y=|f(x)|的图象,</p>
  109. <p><img src="files/image130.png" width="231px" height="144px" /></p>
  110. <p>由图象可知:要使y=-k与函数y=|f(x)|有三个交点,</p>
  111. <p>则有-k≥2,即k≤-2,</p>
  112. <p>故选D.</p>
  113. <p>二、填空题(本大题共4小题,共20.0分)</p>
  114. <p>13.已知角α的终边经过点P(3,<img src="files/image131.png" width="24px" height="24px" />),则与α终边相同的角的集合是______.</p>
  115. <p>【答案】<img src="files/image132.png" width="157px" height="45px" data-latex="$$" /></p>
  116. <p>【解析】</p>
  117. <p>试题分析:由三角函数定义可知<img src="files/image133.png" width="173px" height="45px" data-latex="$$" />,与其终边相同的角为<img src="files/image132.png" width="157px" height="45px" data-latex="$$" /></p>
  118. <p>考点:三角函数定义及角的推广</p>
  119. <p>14.若一扇形的圆心角为2,圆心角所对的弦长为2,则此扇形的面积为______.</p>
  120. <p>【答案】<img src="files/image134.png" width="39px" height="41px" data-latex="$$" /></p>
  121. <p>【解析】</p>
  122. <p>【分析】</p>
  123. <p>先计算出扇形的半径,再用面积公式可得面积.</p>
  124. <p>【详解】依题意可得扇形的半径为<img src="files/image135.png" width="33px" height="41px" data-latex="$$" />,</p>
  125. <p>所以此扇形的面积为<img src="files/image136.png" width="147px" height="41px" data-latex="$$" />.</p>
  126. <p>故答案为: <img src="files/image134.png" width="39px" height="41px" data-latex="$$" />.</p>
  127. <p>【点睛】本题考查了扇形的面积公式,属于基础题.</p>
  128. <p>15.已知命题p:∀x∈[1,2],x<sup>2</sup>-a≥0,命题q:∃x∈R,x<sup>2</sup>+2ax+2-a=0,若命题p且q是真命题,则实数a的取值范围是__________.</p>
  129. <p>【答案】<img src="files/image137.png" width="120px" height="23px" data-latex="$$" />.</p>
  130. <p>【解析】</p>
  131. <p>【分析】</p>
  132. <p>命题<img src="files/image138.png" width="156px" height="27px" data-latex="$$" />,可得<img src="files/image139.png" width="72px" height="31px" data-latex="$$" />,命题<img src="files/image140.png" width="204px" height="25px" data-latex="$$" />,可得<img src="files/image141.png" width="39px" height="19px" data-latex="$$" /> , 结合<img src="files/image48.png" width="15px" height="16px" data-latex="$$" />与<img src="files/image49.png" width="12px" height="19px" data-latex="$$" />为真命题求交集可得结果.</p>
  133. <p><img src="files/image80.png" width="10px" height="18px" data-latex="$$" />详解】命题<img src="files/image138.png" width="156px" height="27px" data-latex="$$" />,<img src="files/image142.png" width="107px" height="31px" data-latex="$$" />,</p>
  134. <p>命题<img src="files/image140.png" width="204px" height="25px" data-latex="$$" />,</p>
  135. <p> <img src="files/image143.png" width="157px" height="27px" data-latex="$$" /> , </p>
  136. <p>解得<img src="files/image144.png" width="35px" height="19px" data-latex="$$" />或<img src="files/image145.png" width="45px" height="19px" data-latex="$$" />,</p>
  137. <p>又<img src="files/image48.png" width="15px" height="16px" data-latex="$$" />,<img src="files/image49.png" width="12px" height="19px" data-latex="$$" />为真命题,<img src="files/image146.png" width="103px" height="48px" data-latex="$$" />,解得<img src="files/image145.png" width="45px" height="19px" data-latex="$$" />或<img src="files/image147.png" width="35px" height="19px" data-latex="$$" />,</p>
  138. <p>故<img src="files/image105.png" width="13px" height="14px" data-latex="$$" />的取值范国是<img src="files/image145.png" width="45px" height="19px" data-latex="$$" />或<img src="files/image147.png" width="35px" height="19px" data-latex="$$" />,故答案为<img src="files/image145.png" width="45px" height="19px" data-latex="$$" />或<img src="files/image147.png" width="35px" height="19px" data-latex="$$" />.</p>
  139. <p>【点睛】本题考查了不等式恒成立问题、不等式的解法、逻辑联接词的应用,考查了推理能力,特称命题与全称命题,意在考查转化与化归思想以及综合应用所学知识解答问题的能力,属于中档题.</p>
  140. <p>16.如果关于<img src="files/image14.png" width="13px" height="15px" data-latex="$$" />的不等式<img src="files/image148.png" width="107px" height="22px" data-latex="$$" />的解集为<img src="files/image149.png" width="17px" height="19px" data-latex="$$" />,则实数<img src="files/image94.png" width="17px" height="15px" data-latex="$$" />的取值范围是___.</p>
  141. <p>【答案】<img src="files/image150.png" width="46px" height="22px" data-latex="$$" /></p>
  142. <p>【解析】</p>
  143. <p>当<img src="files/image99.png" width="40px" height="19px" data-latex="$$" />时,原命题成立,</p>
  144. <p>否则应有:<img src="files/image151.png" width="187px" height="53px" data-latex="$$" />,解得:<img src="files/image152.png" width="74px" height="19px" data-latex="$$" />,</p>
  145. <p>综上可得:实数<img src="files/image94.png" width="17px" height="15px" data-latex="$$" />的取值范围是<img src="files/image153.png" width="47px" height="27px" data-latex="$$" />.</p>
  146. <p>点睛:不等式ax<sup>2</sup>+bx+c>0的解是全体实数(或恒成立)的条件是当a=0时,b=0,c>0;当a≠0时,<img src="files/image154.png" width="44px" height="45px" data-latex="$$" />不等式ax<sup>2</sup>+bx+c<0的解是全体实数(或恒成立)的条件是当a=0时,b=0,c<0;当a≠0时,<img src="files/image155.png" width="44px" height="45px" data-latex="$$" />.</p>
  147. <p>三、解答题(本大题共6小题,共72.0分)</p>
  148. <p>17.已知全集为<img src="files/image34.png" width="16px" height="18px" data-latex="$$" />,函数<img src="files/image156.png" width="96px" height="35.25pt" data-latex="$$" />的定义域为集合<img src="files/image157.png" width="16px" height="18px" data-latex="$$" />,集合<img src="files/image158.png" width="135px" height="29px" data-latex="$$" />.</p>
  149. <p>(1)求<img src="files/image159.png" width="41px" height="20px" data-latex="$$" />; </p>
  150. <p>(2)若<img src="files/image160.png" width="221px" height="27px" data-latex="$$" />,求实数<img src="files/image94.png" width="17px" height="15px" data-latex="$$" />的取值范围.</p>
  151. <p>【答案】(1) <img src="files/image161.png" width="123px" height="27px" data-latex="$$" /> ;(2)<img src="files/image162.png" width="52px" height="27px" data-latex="$$" /> </p>
  152. <p>【解析】</p>
  153. <p>试题分析:(1)通过解不等式求得集合<img src="files/image163.png" width="35px" height="21px" data-latex="$$" />再求交集<img src="files/image164.png" width="117px" height="29px" data-latex="$$" />;(2)根据集合的子集关系求参数的范围.注意讨论空集的情况.</p>
  154. <p>试题解析:(1)由<img src="files/image165.png" width="56px" height="19px" data-latex="$$" /> 得, 函数<img src="files/image166.png" width="39px" height="27px" data-latex="$$" /> 的定义域<img src="files/image167.png" width="91px" height="21px" data-latex="$$" />,又<img src="files/image168.png" width="88px" height="21px" data-latex="$$" />, 得<img src="files/image169.png" width="149px" height="27px" data-latex="$$" />,<img src="files/image170.png" width="136px" height="27px" data-latex="$$" />.</p>
  155. <p>(2)<img src="files/image171.png" width="141px" height="21px" data-latex="$$" />,①当<img src="files/image172.png" width="45px" height="19px" data-latex="$$" /> 时,满足要求, 此时<img src="files/image173.png" width="63px" height="19px" data-latex="$$" />, 得<img src="files/image174.png" width="43px" height="41px" data-latex="$$" />;②当<img src="files/image175.png" width="45px" height="19px" data-latex="$$" /> 时,要<img src="files/image176.png" width="128px" height="21px" data-latex="$$" />,则<img src="files/image177.png" width="75px" height="75px" data-latex="$$" />,解得<img src="files/image178.png" width="67px" height="41px" data-latex="$$" />,由①② 得,<img src="files/image179.png" width="40px" height="19px" data-latex="$$" />,<img src="files/image180.png" width="15px" height="13px" data-latex="$$" />实数<img src="files/image94.png" width="17px" height="15px" data-latex="$$" /> 的取值范围<img src="files/image162.png" width="52px" height="27px" data-latex="$$" />.</p>
  156. <p>点睛:(1)认清元素的属性,解决集合问题时,认清集合中元素的属性(是点集、数集或其他情形)和化简集合是正确求解的两个先决条件.</p>
  157. <p>(2)注意元素的互异性.在解决含参数的集合问题时,要注意检验集合中元素的互异性,否则很可能会因为不满足“互异性”而导致解题错误.</p>
  158. <p>(3)防范空集.在解决有关<img src="files/image181.png" width="119px" height="21px" data-latex="$$" />等集合问题时,往往忽略空集的情况,一定先考虑<img src="files/image149.png" width="17px" height="19px" data-latex="$$" />是否成立,以防漏解.</p>
  159. <p>18.(1)计算:<img src="files/image182.png" width="145px" height="44px" data-latex="$$" />;</p>
  160. <p>(2)计算:<img src="files/image183.png" width="171px" height="42px" data-latex="$$" /></p>
  161. <p>【答案】(1)<img src="files/image184.png" width="21px" height="41px" data-latex="$$" />(2)3</p>
  162. <p>【解析】</p>
  163. <p>【分析】</p>
  164. <p>(1)根据指数幂的运算性质计算即可,</p>
  165. <p>(2)根据对数的运算性质计算即可.</p>
  166. <p>【详解】(1)原式=<img src="files/image185.png" width="29px" height="31px" data-latex="$$" />+<img src="files/image186.png" width="59px" height="47px" data-latex="$$" />-1=4+<img src="files/image187.png" width="24px" height="42px" data-latex="$$" />-1=<img src="files/image188.png" width="21px" height="41px" data-latex="$$" />;</p>
  167. <p>(2)原式=<img src="files/image189.png" width="360px" height="24px" data-latex="$$" /></p>
  168. <p>【点睛】本题考查了指数幂的运算性质和对数的运算性质,属于基础题.</p>
  169. <p>19.已知命题<img src="files/image190.png" width="91px" height="45px" data-latex="$$" />,命题<img src="files/image191.png" width="165px" height="21px" data-latex="$$" />,若<img src="files/image192.png" width="25px" height="17px" data-latex="$$" />是<img src="files/image193.png" width="25px" height="17px" data-latex="$$" />的必要不充分条件,求实数<img src="files/image194.png" width="17px" height="15px" />的取值范围.</p>
  170. <p>【答案】<img src="files/image195.png" width="74px" height="26px" data-latex="$$" /></p>
  171. <p>【解析】</p>
  172. <p>【分析】</p>
  173. <p>化简命题p:-2≤x≤10,若¬p是¬q<img src="files/image196.png" width="14px" height="19px" data-latex="$$" />必要不充分条件等价于q是p的必要不充分条件,从而可列出不等式组,求解即可.</p>
  174. <p>【详解】由题意得p:-2≤x≤10. </p>
  175. <p> ∵¬p是¬q的必要不充分条件,</p>
  176. <p>∴q是p的必要不充分条件. </p>
  177. <p>∴p⇒q,q<img src="files/image197.png" width="20px" height="16px" data-latex="$$" />p.</p>
  178. <p>∴<img src="files/image198.png" width="76px" height="48px" data-latex="$$" />∴<img src="files/image199.png" width="48px" height="48px" data-latex="$$" />∴m≥9. </p>
  179. <p> 所以实数m的取值范围为{m|m≥9}.</p>
  180. <p>【点睛】本题主要考查了必要不充分条件,逆否命题,属于中档题.</p>
  181. <p>20.已知角<img src="files/image200.png" width="16px" height="15px" data-latex="$$" />终边上有一点<img src="files/image201.png" width="59px" height="27px" data-latex="$$" />,求下列各式的值.</p>
  182. <p>(1)<img src="files/image202.png" width="39px" height="17px" data-latex="$$" />; </p>
  183. <p>(2)<img src="files/image203.png" width="88px" height="41px" data-latex="$$" /></p>
  184. <p>【答案】(1)<img src="files/image204.png" width="96px" height="30.75pt" data-latex="$$" />;(2)<img src="files/image205.png" width="25px" height="41px" data-latex="$$" /></p>
  185. <p>【解析】</p>
  186. <p><img src="files/image80.png" width="10px" height="18px" data-latex="$$" />分析】</p>
  187. <p>(1)根据三角函数的定义,可知<img src="files/image206.png" width="65px" height="41px" data-latex="$$" />;</p>
  188. <p>(2)原式上下同时除以<img src="files/image207.png" width="39px" height="15px" data-latex="$$" />,变为<img src="files/image202.png" width="39px" height="17px" data-latex="$$" />表示的式子,即可求得结果.</p>
  189. <p>【详解】(1)<img src="files/image208.png" width="133px" height="41px" data-latex="$$" /> </p>
  190. <p>(2)<img src="files/image209.png" width="84px" height="19px" data-latex="$$" />,<img src="files/image210.png" width="76px" height="19px" data-latex="$$" /> </p>
  191. <p>原式上下同时除以<img src="files/image207.png" width="39px" height="15px" data-latex="$$" /> </p>
  192. <p><img src="files/image211.png" width="261px" height="47px" data-latex="$$" />.</p>
  193. <p>【点睛】本题考查了三角函数的定义,属于基础题型.</p>
  194. <p>21.已知函数<img src="files/image212.png" width="147px" height="29px" data-latex="$$" />是指数函数.</p>
  195. <p>(1)求<img src="files/image213.png" width="33px" height="20px" data-latex="$$" />的表达式;</p>
  196. <p>(2)判断<img src="files/image214.png" width="137px" height="21px" data-latex="$$" /><img src="files/image196.png" width="14px" height="19px" data-latex="$$" />奇偶性,并加以证明<img src="files/image215.png" width="4px" height="19px" /> </p>
  197. <p>(3)解不等式:<img src="files/image216.png" width="156px" height="24px" data-latex="$$" />.</p>
  198. <p>【答案】(1)<img src="files/image217.png" width="57px" height="23px" data-latex="$$" />(2)见证明;(3)<img src="files/image218.png" width="112px" height="41px" data-latex="$$" /></p>
  199. <p>【解析】</p>
  200. <p>【分析】</p>
  201. <p>(1)根据指数函数定义得到,<img src="files/image219.png" width="92px" height="21px" data-latex="$$" />检验得到答案.</p>
  202. <p>(2) <img src="files/image220.png" width="100px" height="24px" data-latex="$$" />,判断<img src="files/image221.png" width="83px" height="21px" data-latex="$$" />关系得到答案.</p>
  203. <p>(3)利用函数的单调性得到答案.</p>
  204. <p>【详解】解:(1)∵函数<img src="files/image212.png" width="147px" height="29px" data-latex="$$" />是指数函数,<img src="files/image222.png" width="37px" height="19px" data-latex="$$" />且<img src="files/image223.png" width="35px" height="19px" data-latex="$$" />,</p>
  205. <p>∴<img src="files/image219.png" width="92px" height="21px" data-latex="$$" />,可得<img src="files/image224.png" width="37px" height="19px" data-latex="$$" />或<img src="files/image225.png" width="31px" height="17px" data-latex="$$" />(舍去),∴<img src="files/image217.png" width="57px" height="23px" data-latex="$$" />;</p>
  206. <p>(2)由(1)得<img src="files/image220.png" width="100px" height="24px" data-latex="$$" />,</p>
  207. <p>∴<img src="files/image226.png" width="109px" height="24px" data-latex="$$" />,∴<img src="files/image227.png" width="103px" height="21px" data-latex="$$" />,∴<img src="files/image228.png" width="36px" height="21px" data-latex="$$" />是奇函数;</p>
  208. <p>(3)不等式:<img src="files/image229.png" width="156px" height="24px" data-latex="$$" />,以2为底单调递增,</p>
  209. <p>即<img src="files/image230.png" width="103px" height="19px" data-latex="$$" />,</p>
  210. <p>∴<img src="files/image231.png" width="83px" height="41px" data-latex="$$" />,解集为<img src="files/image218.png" width="112px" height="41px" data-latex="$$" />.</p>
  211. <p>【点睛】本题考查了函数的定义,函数的奇偶性,解不等式,意在考查学生的计算能力.</p>
  212. <p>22.设<img src="files/image232.png" width="40px" height="19px" data-latex="$$" />是常数,函数<img src="files/image233.png" width="115px" height="41px" data-latex="$$" />.</p>
  213. <p>(1)用定义证明函数<img src="files/image11.png" width="39px" height="26px" data-latex="$$" />是增函数;</p>
  214. <p>(2)试确定<img src="files/image105.png" width="13px" height="14px" data-latex="$$" />的值,使<img src="files/image11.png" width="39px" height="26px" data-latex="$$" />是奇函数;</p>
  215. <p>(3)当<img src="files/image11.png" width="39px" height="26px" data-latex="$$" />是奇函数时,求<img src="files/image11.png" width="39px" height="26px" data-latex="$$" />的值域.</p>
  216. <p>【答案】(1) 详见解析(2) <img src="files/image234.png" width="44px" height="27px" data-latex="$$" /></p>
  217. <p>【解析】</p>
  218. <p>试题分析:(1)证明函数单调性可根据函数单调性定义取值,作差变形,定号从而写结论(2)因为函数是奇函数所以<img src="files/image235.png" width="260px" height="41px" data-latex="$$" />(3)由<img src="files/image236.png" width="111px" height="41px" data-latex="$$" />.故<img src="files/image237.png" width="109px" height="41px" data-latex="$$" />,∴<img src="files/image238.png" width="35px" height="21px" data-latex="$$" /></p>
  219. <p>试题解析:</p>
  220. <p>(1)设<img src="files/image239.png" width="120px" height="24px" data-latex="$$" />,</p>
  221. <p>则<img src="files/image240.png" width="328px" height="53px" data-latex="$$" />.<img src="files/image241.png" width="24px" height="27px" data-latex="$$" /></p>
  222. <p>∵函数<img src="files/image242.png" width="44px" height="24px" data-latex="$$" />是增函数,又<img src="files/image243.png" width="45px" height="24px" data-latex="$$" />,∴<img src="files/image244.png" width="80px" height="21px" data-latex="$$" />,</p>
  223. <p>而<img src="files/image245.png" width="65px" height="21px" data-latex="$$" />,<img src="files/image246.png" width="67px" height="21px" data-latex="$$" />,∴<img src="files/image241.png" width="24px" height="27px" data-latex="$$" />式<img src="files/image247.png" width="25px" height="19px" data-latex="$$" />.</p>
  224. <p>∴<img src="files/image248.png" width="99px" height="27px" data-latex="$$" />,即<img src="files/image166.png" width="39px" height="27px" data-latex="$$" />是<img src="files/image34.png" width="16px" height="18px" data-latex="$$" />上的增函数.</p>
  225. <p>(2)∵<img src="files/image235.png" width="260px" height="41px" data-latex="$$" />对<img src="files/image249.png" width="39px" height="19px" data-latex="$$" />恒成立,</p>
  226. <p>∴<img src="files/image147.png" width="35px" height="19px" data-latex="$$" />.</p>
  227. <p>(3)当<img src="files/image147.png" width="35px" height="19px" data-latex="$$" />时,<img src="files/image250.png" width="136px" height="41px" data-latex="$$" />.</p>
  228. <p>∴<img src="files/image237.png" width="109px" height="41px" data-latex="$$" />,∴<img src="files/image238.png" width="35px" height="21px" data-latex="$$" />,</p>
  229. <p>继续解得<img src="files/image251.png" width="91px" height="44px" data-latex="$$" />,</p>
  230. <p>∴<img src="files/image252.png" width="67px" height="21px" data-latex="$$" />,因此,函数<img src="files/image166.png" width="39px" height="27px" data-latex="$$" />的值域是<img src="files/image253.png" width="44px" height="27px" data-latex="$$" />.</p>
  231. <p>点睛:本题考差了函数单调性,奇偶性的概念及其判断、证明,函数的值域求法,对于定义来证明单调性要注意做差后的式子的化简.</p>
  232. </body></html>