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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(   )

发布时间:2021-07-19

A.3,一11

B.-3,一11

C.11,—3

D.11,3

试卷相关题目

  • 1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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  • 2变量 http://picflow.koolearn.com/upload/papers/20140824/20140824040055947432.png满足约束条件 http://picflow.koolearn.com/upload/papers/20140824/201408240400559781041.png,若使 http://picflow.koolearn.com/upload/papers/20140824/20140824040055994528.png取得最大值的最优解有无数个,则实数 http://picflow.koolearn.com/upload/papers/20140824/20140824040056072283.png的取值集合是(      )

    A.http://picflow.koolearn.com/upload/papers/20140824/20140824040056088495.png

    B.http://picflow.koolearn.com/upload/papers/20140824/20140824040056134461.png

    C.http://picflow.koolearn.com/upload/papers/20140824/20140824040056150440.png

    D.http://picflow.koolearn.com/upload/papers/20140824/20140824040056166520.png

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  • 3某公司生产甲,乙两种桶装产品,已知生产甲产品1桶需耗A原料1千克,B原料2千克;生产乙产品1桶需耗A原料2千克,B原料1千克.每桶甲产品的利润是300元,每桶乙产品的利润是400元.公司在生产这两种产品的计划中,要求每天消耗A,B原料都不超过12千克.通过合理安排生产计划,从每天生产的甲,乙两种产品中,公司可获得的最大利润是(  )

    A.2200元

    B.2400元

    C.2600元

    D.2800元

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  • 4设不等式组 http://picflow.koolearn.com/upload/papers/20140824/201408240347105031382.png表示的平面区域为 D.若指数函数 y= ax的图象上存在区域 D上的点,则 a的取值范围是(  ).

    A.(1,3]

    B.[2,3]

    C.(1,2]

    D.[3,+∞)

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  • 5若实数 http://picflow.koolearn.com/upload/papers/20140824/20140824041747890403.png满足 http://picflow.koolearn.com/upload/papers/20140824/20140824041747905611.png,则 http://picflow.koolearn.com/upload/papers/20140824/20140824041747921610.png的取值范围是(  )

    A.http://picflow.koolearn.com/upload/papers/20140824/20140824041747937577.png

    B.http://picflow.koolearn.com/upload/papers/20140824/20140824041747952560.png

    C.http://picflow.koolearn.com/upload/papers/20140824/20140824041747968575.png

    D.http://picflow.koolearn.com/upload/papers/20140824/20140824041747968650.png

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  • 6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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  • 7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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  • 8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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  • 9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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  • 10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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