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已知关于x,y的不等式组http://picflow.koolearn.com/upload/papers/g02/20120920/201209202009167643953.png,所表示的平面区域的面积为l6,则k的值为

发布时间:2021-07-16

A.﹣l

B.2

C.1

D.3

试卷相关题目

  • 1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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  • 2x、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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  • 3设点A(1,0),B(2,1),如果直线ax+by=1与线段AB有一个公共点,那么a2+b2

    A.最小值为http://picflow.koolearn.com/upload/papers/g02/20120922/20120922194838154574.png

    B.最小值为http://picflow.koolearn.com/upload/papers/g02/20120922/20120922194840224968.png

    C.最大值为http://picflow.koolearn.com/upload/papers/g02/20120922/20120922194840488574.png

    D.最大值为http://picflow.koolearn.com/upload/papers/g02/20120922/20120922194842125968.png

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  • 4设x,y∈R且http://picflow.koolearn.com/upload/papers/g02/20120920/201209202047272863353.png,则z=x+2y的最小值等于http://picflow.koolearn.com/upload/papers/g02/20120920/2012092020472788210255.png

    A.2

    B.3

    C.5

    D.9

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  • 5设变量x,y满足约束条件http://picflow.koolearn.com/upload/papers/g02/20120918/201209181110415444600.png则目标函数z=3x-2y的最小值为

    A.-5

    B.-4

    C.-2

    D.3

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  • 6已知变量x,y满足约束条件http://picflow.koolearn.com/upload/papers/g02/20120922/201209221945206983854.png,若目标函数z=2x+y的最大值是

    A.6

    B.3

    C.http://picflow.koolearn.com/upload/papers/g02/20120922/20120922194520934605.png

    D.1

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  • 7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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  • 8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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  • 9某农户计划种植黄瓜和韭菜,种植面积不超过50亩,投入资金不超过54万元,假设种植黄瓜和韭菜的产量、成本和售价如下表,为使一年的种植总利润(总利润=总销售收入-总种植成本)最大,那么黄瓜和韭菜的种植面积(单位:亩)分别为http://picflow.koolearn.com/upload/papers/g02/20120919/201209191322530283760.png

    A.50,0

    B.30,20

    C.20,30

    D.0,50

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  • 10若变量x,y满足约束条件http://picflow.koolearn.com/upload/papers/g02/20120918/201209181104391883496.png,则z=2x+y﹣4的最大值为

    A.﹣4

    B.﹣1

    C.1

    D.5

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