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已知变量x,y满足约束条件http://picflow.koolearn.com/upload/papers/g02/20120824/201208241408226303760.png则z=2x+y的最大值为            

发布时间:2021-07-19

A.1

B.2

C.3

D.4

试卷相关题目

  • 1已知点P(x,y)的坐标满足条件http://picflow.koolearn.com/upload/papers/g02/20120829/201208290850033552809.png,则x+2y的最大值为 

    A.3

    B.6

    C.8

    D.7

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  • 2若x,y满足约束条件http://picflow.koolearn.com/upload/papers/g02/20120822/201208222041517383459.png,目标函数z=kx+2y仅在点(1,1)处取得最小值,则k的取值范围是

    A.(﹣1,2)

    B.(﹣4,2)

    C.(﹣4,0]

    D.(﹣2,4)

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  • 3若变量x,y满足约束条件http://picflow.koolearn.com/upload/papers/g02/20120919/201209191646320233445.png,则z=2x+y﹣4的最大值为 

    A.﹣4

    B.﹣1

    C.1

    D.5

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  • 4已知变量x,y满足http://picflow.koolearn.com/upload/papers/g02/20120916/201209161625434593539.png,则z=|y﹣x|的最大值为

    A.1

    B.http://picflow.koolearn.com/upload/papers/g02/20120916/201209161625436171037.png

    C.3

    D.http://picflow.koolearn.com/upload/papers/g02/20120916/20120916162543752642.png

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  • 5设点P(x,y)满足:http://picflow.koolearn.com/upload/papers/g02/20120902/201209021910377373668.png,则http://picflow.koolearn.com/upload/papers/g02/20120902/201209021910377681025.png的取值范围是

    A.[http://picflow.koolearn.com/upload/papers/g02/20120902/201209021910377991308.png

    B.http://picflow.koolearn.com/upload/papers/g02/20120902/201209021910378311456.png

    C.http://picflow.koolearn.com/upload/papers/g02/20120902/201209021910378621221.png

    D.[﹣1,1]

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  • 6设变量x,y满足约束条件http://picflow.koolearn.com/upload/papers/g02/20120816/201208161810082073284.png则目标函数z=x+2y的最小值为

    A.2

    B.3

    C.5

    D.9

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  • 7在如图所示的坐标平面的可行域(阴影部分且包括边界)内,若是目标函数z=ax+y(a>0)取得最大值的最优解有无数个,则a的值等于http://picflow.koolearn.com/upload/papers/g02/20120820/2012082021303637817400.png

    A.http://picflow.koolearn.com/upload/papers/g02/20120820/20120820213036611269.png

    B.1

    C.6

    D.3

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  • 8设a>0,点集S的点(x,y)满足下列所有条件:①http://picflow.koolearn.com/upload/papers/g02/20120902/201209021909531001725.png;②http://picflow.koolearn.com/upload/papers/g02/20120902/201209021909531291728.png;③x+ya; ④x+a≥y;⑤y+a≥x.则S的边界是一个有几条边的多边形

    A.4

    B.5

    C.6

    D.7

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  • 9已知点(x,y)是不等式组http://picflow.koolearn.com/upload/papers/g02/20120917/201209171713237683867.png表示的平面区域内的一个动点,且目标函数z=2x+y的最大值为7,最小值为1,则http://picflow.koolearn.com/upload/papers/g02/20120917/201209171713238961593.png的值为

    A.2

    B.http://picflow.koolearn.com/upload/papers/g02/20120917/20120917171324030592.png

    C.﹣2

    D.﹣1

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  • 10x、y满足约束条件http://picflow.koolearn.com/upload/papers/g02/20120916/201209161511494793755.png,若目标函数z=ax+by(a>0,b>0)的最大值为7,则http://picflow.koolearn.com/upload/papers/g02/20120916/201209161511495911226.png的最小值为

    A.14

    B.7

    C.18

    D.13

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