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高中数学代数与函数一其他练习题111

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  • 卷面总分:100分
  • 试卷类型:真题试卷
  • 测试费用:¥5.00
  • 试卷答案:有
  • 练习次数:0
  • 作答时间:60分钟

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高中数学代数与函数一其他练习题111

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  • 31已知点A(a,b)与点B(1,0)在直线3x-4y+10=0的两侧,给出下列说法: ①3a-4b+10>0; ②当a>0时,a+b有最小值,无最大值; ③ http://picflow.koolearn.com/upload/papers/20140824/20140824035622900544.png>2; ④当a>0且a≠1,b>0时, http://picflow.koolearn.com/upload/papers/20140824/20140824035622916456.png的取值范围为 http://picflow.koolearn.com/upload/papers/20140824/20140824035622947758.pnghttp://picflow.koolearn.com/upload/papers/20140824/20140824035622962767.png. 其中正确的个数是(    )

    A.1

    B.2

    C.3

    D.4

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  • 32设变量x.y满足约束条件 http://picflow.koolearn.com/upload/papers/20140824/201408240402204531266.png则目标函数 http://picflow.koolearn.com/upload/papers/20140824/20140824040220453605.png的最大值和最小值分别为(   )

    A.3,一11

    B.-3,一11

    C.11,—3

    D.11,3

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  • 33已知实数 x, y满足不等式组 http://picflow.koolearn.com/upload/papers/20140824/201408240350519141222.png则2 x- y+3的最小值是(  )

    A.3

    B.4

    C.6

    D.9

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  • 34已知 http://picflow.koolearn.com/upload/papers/20140824/20140824040038397432.png满足 http://picflow.koolearn.com/upload/papers/20140824/20140824040038428897.png时, http://picflow.koolearn.com/upload/papers/20140824/201408240400384441004.png的最大值为1,则 http://picflow.koolearn.com/upload/papers/20140824/20140824040038460397.png的最小值为(   )

    A.7

    B.8

    C.9

    D.10

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  • 35若变量 x, y满足约束条件 http://picflow.koolearn.com/upload/papers/20140824/20140824034845585974.png则 x+2 y的最大值是(  )

    A.-http://picflow.koolearn.com/upload/papers/20140824/20140824034845585368.png

    B.1

    C.http://picflow.koolearn.com/upload/papers/20140824/20140824034845616356.png

    D.http://picflow.koolearn.com/upload/papers/20140824/20140824034845585368.png

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  • 36点(x,y)满足 http://picflow.koolearn.com/upload/papers/20140824/201408240356224941026.png若目标函数z=x-2y的最大值为1,则实数a的值是(    )

    A.1

    B.-1

    C.-3

    D.3

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  • 37已知点 http://picflow.koolearn.com/upload/papers/20140824/20140824041735145802.png,直线 http://picflow.koolearn.com/upload/papers/20140824/20140824041735160955.png与线段 http://picflow.koolearn.com/upload/papers/20140824/20140824041735176392.png相交,则 http://picflow.koolearn.com/upload/papers/20140824/20140824041735191609.png最小值为(   )

    A.http://picflow.koolearn.com/upload/papers/20140824/20140824041735191457.png

    B.http://picflow.koolearn.com/upload/papers/20140824/20140824041735207370.png

    C.http://picflow.koolearn.com/upload/papers/20140824/20140824041735223488.png

    D.http://picflow.koolearn.com/upload/papers/20140824/20140824041735238346.png

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  • 38当变量 http://picflow.koolearn.com/upload/papers/20140824/20140824041926061403.png满足约束条件 http://picflow.koolearn.com/upload/papers/20140824/201408240419261541333.png的最大值为8,则实数 http://picflow.koolearn.com/upload/papers/20140824/20140824041926170337.png的值是(   )

    A.-4

    B.-3

    C.-2

    D.-1

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  • 39设 x, y满足约束条件 http://picflow.koolearn.com/upload/papers/20140824/201408240347591911059.png则 z=2 x-3 y的最小值是(  )

    A.-7

    B.-6

    C.-5

    D.-3

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  • 40某运输公司有12名驾驶员和19名工人,有8辆载重为10吨的甲型卡车和7辆载重为6吨的乙型卡车.某天需运往A地至少72吨的货物,派用的每辆车需满载且只运送一次,派用的每辆甲型卡车需配2名工人,运送一次可得利润450元;派用的每辆乙型卡车需配1名工人,运送一次可得利润350元.该公司合理计划当天派用两类卡车的车辆数,可得最大利润z=(  )

    A.4650元

    B.4700元

    C.4900元

    D.5000元

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