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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

发布时间:2021-07-19

A.﹣4

B.﹣1

C.1

D.5

试卷相关题目

  • 1已知实数x,y满足http://picflow.koolearn.com/upload/papers/g02/20120821/201208211040450753351.png则z=x+2y的最小值是

    A.﹣3

    B.﹣2

    C.3

    D.2

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  • 2设变量x,y满足约束条件http://picflow.koolearn.com/upload/papers/g02/20120708/201207081740056573517.png,则http://picflow.koolearn.com/upload/papers/g02/20120708/201207081740056841064.png的最大值是

    A.1

    B.http://picflow.koolearn.com/upload/papers/g02/20120708/20120708174005710607.png

    C.http://picflow.koolearn.com/upload/papers/g02/20120708/20120708174005740586.png

    D.2

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  • 3曲线http://picflow.koolearn.com/upload/papers/g02/20120604/201206041152112321467.png在点(0,-2)处的切线与直线x=0和y=x+2所围成的区域内(包括边界)有一动点P(x,y),若z=2x-y,则z的取值范围是

    A.[-2,2]

    B.[-2,4]

    C.[-4,-2]

    D.[-4,2]

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  • 4实数x,y满足不等式组http://picflow.koolearn.com/upload/papers/g02/20120902/201209021804008132680.png,则http://picflow.koolearn.com/upload/papers/g02/20120902/201209021804008441235.png的取值范围是

    A.[﹣1,1)

    B.(﹣∞,0)

    C.[﹣1,+∞)

    D.[﹣1,0]

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  • 5在如图所示的坐标平面的可行域(阴影部分且包括边界)内,目标函数z=2x﹣ay取得最大值的最优解有无数个,则a为  http://picflow.koolearn.com/upload/papers/g02/20120926/201209261445448707749.png

    A.﹣2

    B.2

    C.﹣6

    D.6

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  • 6若x,y满足约束条件http://picflow.koolearn.com/upload/papers/g02/20120916/201209161436355654331.png,则z=x+2y的最大值是

    A.16

    B.3

    C.http://picflow.koolearn.com/upload/papers/g02/20120916/20120916143635691862.png

    D.20

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  • 7已知变量x,y满足http://picflow.koolearn.com/upload/papers/g02/20120914/201209142109327724207.png,目标函数是z=2x+y,则有

    A.zmax=12,zmin=3

    B.zmax=12,z无最小值

    C.zmin=3,z无最大值

    D.z既无最大值,也无最小值

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  • 8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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  • 9若实数x,y满足不等式组合http://picflow.koolearn.com/upload/papers/g02/20120829/201208291622443234831.png则x+y的最大值为  

    A.9

    B.http://picflow.koolearn.com/upload/papers/g02/20120829/20120829162244348936.png

    C.1

    D.http://picflow.koolearn.com/upload/papers/g02/20120829/20120829162244372936.png

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  • 10设变量x,y满足约束条件http://picflow.koolearn.com/upload/papers/g02/20120919/201209192133186123079.png,则目标函数z=5x+y的最大值为

    A.2

    B.3

    C.4

    D.5

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