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已知实数 http://picflow.koolearn.com/upload/papers/20140824/20140824044031051403.png满足不等式组 http://picflow.koolearn.com/upload/papers/20140824/201408240440310831117.png则目标函数 http://picflow.koolearn.com/upload/papers/20140824/20140824044031098587.png的最小值 http://picflow.koolearn.com/upload/papers/20140824/20140824044031114337.png与最大值 http://picflow.koolearn.com/upload/papers/20140824/20140824044031129399.png的积为()

发布时间:2021-07-19

A.http://picflow.koolearn.com/upload/papers/20140824/20140824044031129361.png

B.http://picflow.koolearn.com/upload/papers/20140824/20140824044031145383.png

C.http://picflow.koolearn.com/upload/papers/20140824/20140824044031161379.png

D.http://picflow.koolearn.com/upload/papers/20140824/20140824044031176365.png

试卷相关题目

  • 1曲线f(x)= http://picflow.koolearn.com/upload/papers/20140824/20140824043752602322.png(其中e为自然对数的底数)在点(0,1)处的切线与直线y=-x+3和x轴所围成的区域为D(包含边界),点P(x,y)为区域D内的动点,则z=x-3y的最大值为(    )

    A.3

    B.4

    C.-1

    D.2

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  • 2设x,y满足约束条件 http://picflow.koolearn.com/upload/papers/20140824/201408240444529761092.png,若目标函数z=ax+by(a>0,b>0)的最大值为12,则 http://picflow.koolearn.com/upload/papers/20140824/20140824044452991642.png的最小值为(   )

    A.http://picflow.koolearn.com/upload/papers/20140824/20140824044453007374.png

    B.http://picflow.koolearn.com/upload/papers/20140824/20140824044453007438.png

    C.1

    D.2

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  • 3实数x,y满足 http://picflow.koolearn.com/upload/papers/20140824/201408240505261111036.png,若目标函数z=x+y取得最大值4,则实数a的值为(  )

    A.4

    B.3

    C.2

    D.http://picflow.koolearn.com/upload/papers/20140824/20140824050526127388.png

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  • 4设变量x,y满足约束条件 http://picflow.koolearn.com/upload/papers/20140824/201408240512340041001.png,则z=x-3y的最大值为(   )

    A.http://picflow.koolearn.com/upload/papers/20140824/20140824051234020257.png

    B.4

    C.3

    D.http://picflow.koolearn.com/upload/papers/20140824/20140824051234036300.png

    开始考试点击查看答案
  • 5已知 http://picflow.koolearn.com/upload/papers/20140824/20140824045525822499.png满足 http://picflow.koolearn.com/upload/papers/20140824/201408240455258381144.png,且 http://picflow.koolearn.com/upload/papers/20140824/20140824045525853483.png的最大值不小于6,则实数m的取值范围是(   )

    A.http://picflow.koolearn.com/upload/papers/20140824/20140824045525869503.png

    B.http://picflow.koolearn.com/upload/papers/20140824/20140824045525885529.png

    C.http://picflow.koolearn.com/upload/papers/20140824/20140824045525916622.png

    D.http://picflow.koolearn.com/upload/papers/20140824/20140824045525931622.png

    开始考试点击查看答案
  • 6若不等式组 http://picflow.koolearn.com/upload/papers/20140824/201408240445379041379.png所表示的平面区域被直线 http://picflow.koolearn.com/upload/papers/20140824/20140824044537920650.png分成面积相等的两 部分,则k的值为(   )

    A.4

    B.3

    C.2

    D.1

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  • 7已知平面直角坐标系xOy上的区域D由不等式组 http://picflow.koolearn.com/upload/papers/20140824/201408240447587101017.png给定. 若 http://picflow.koolearn.com/upload/papers/20140824/20140824044758725612.png为D上的动点,点A的坐标为 http://picflow.koolearn.com/upload/papers/20140824/20140824044758741463.png,则 http://picflow.koolearn.com/upload/papers/20140824/20140824044758757707.png的最大值为(   )

    A.3

    B.4

    C.http://picflow.koolearn.com/upload/papers/20140824/20140824044758772391.png

    D.http://picflow.koolearn.com/upload/papers/20140824/20140824044758788378.png

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  • 8已知x,y满足约束条件 http://picflow.koolearn.com/upload/papers/20140824/201408240436058821141.png,设M,m分别为目标函数z=3x+5y的最大、最小值,则M–m,为(   )

    A.9

    B.11

    C.17

    D.28

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  • 9已知实数x,y满足约束条件 http://picflow.koolearn.com/upload/papers/20140824/201408240518499811082.png,则 http://picflow.koolearn.com/upload/papers/20140824/20140824051849996599.png的最小值是( )

    A.5

    B.-6

    C.10

    D.-l0

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  • 10已知a,b是正数,且满足2<a+2b<4,那么 http://picflow.koolearn.com/upload/papers/20140824/20140824045521844490.png的取值范围是

    A.http://picflow.koolearn.com/upload/papers/20140824/20140824045521860678.png

    B.http://picflow.koolearn.com/upload/papers/20140824/20140824045521875681.png

    C.http://picflow.koolearn.com/upload/papers/20140824/20140824045521891659.png

    D.http://picflow.koolearn.com/upload/papers/20140824/20140824045521907660.png

    开始考试点击查看答案
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