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已知实数x、y满足约束条件http://picflow.koolearn.com/upload/papers/g02/20120923/201209231443293202636.png,则z=2x+4y的最大值为 

发布时间:2021-07-19

A.24

B.20

C.16

D.12

试卷相关题目

  • 1已知http://picflow.koolearn.com/upload/papers/g02/20120921/20120921172948256506.png满足不等式组http://picflow.koolearn.com/upload/papers/g02/20120921/201209211729483292377.png,则http://picflow.koolearn.com/upload/papers/g02/20120921/201209211729483872009.png的最小值为

    A.http://picflow.koolearn.com/upload/papers/g02/20120921/20120921172949115578.png

    B.2

    C.3

    D.http://picflow.koolearn.com/upload/papers/g02/20120921/20120921172949178662.png

    开始考试点击查看答案
  • 2已知实数x、y满足约束条件http://picflow.koolearn.com/upload/papers/g02/20120923/201209231523505722673.png,则z=2x+4y的最大值为  

    A.24

    B.20

    C.16

    D.12

    开始考试点击查看答案
  • 3在直角坐标系xOy中,已知△AOB三边所在直线的方程分别为x=0,y=0,2x+3y=30,则△AOB内部和边上整点(即横、纵坐标均为整数的点)的总数是(  )

    A.95

    B.91

    C.88

    D.75

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  • 4实数x,y满足x≥2y≥2x+y<6则x+3y的取值范围是(  )

    A.[8,10)

    B.[8,10]

    C.[8,14]

    D.[8,14)

    开始考试点击查看答案
  • 5设不等式组http://picflow.koolearn.com/upload/papers/g02/20121007/201210070920278452413.png所表示的平面区域是http://picflow.koolearn.com/upload/papers/g02/20121007/20121007092028456548.png,平面区域http://picflow.koolearn.com/upload/papers/g02/20121007/20121007092029039577.pnghttp://picflow.koolearn.com/upload/papers/g02/20121007/20121007092029601548.png关于直线http://picflow.koolearn.com/upload/papers/g02/20121007/201210070920301591509.png对称,对于http://picflow.koolearn.com/upload/papers/g02/20121007/20121007092030693548.png中的任意一点http://picflow.koolearn.com/upload/papers/g02/20121007/20121007092031240462.pnghttp://picflow.koolearn.com/upload/papers/g02/20121007/20121007092031760577.png中的任意一点http://picflow.koolearn.com/upload/papers/g02/20121007/20121007092032306462.png, http://picflow.koolearn.com/upload/papers/g02/20121007/20121007092032864899.png的最小值为

    A.http://picflow.koolearn.com/upload/papers/g02/20121007/20121007092033387829.png

    B.http://picflow.koolearn.com/upload/papers/g02/20121007/20121007092033928732.png

    C.4

    D.2

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  • 6若不等式组x≥0x+y≥23x+y≤5所表示的平面区域被直线y=kx+2分成面积相等的两部分,则k的值为(  )

    A.4

    B.1

    C.2

    D.3

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  • 7若变量a,b满足约束条件http://picflow.koolearn.com/upload/papers/g02/20121006/201210062056526622933.png,n=2a+3b,则n的最小值为                  

    A.2

    B.3

    C.4

    D.5

    开始考试点击查看答案
  • 8若x、y满足2x+y≤8x+3y≤9x≥0,y≥0,则z=x+2y的最大值为(  )

    A.9

    B.8

    C.7

    D.6

    开始考试点击查看答案
  • 9已知实数x、y满足约束条件x≥2y≥2x+y≤6,则z=2x+4y的最大值为(  )

    A.24

    B.20

    C.16

    D.12

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  • 10某家具厂制造甲、乙两种型号的桌子,每张桌子需木工和漆工两道工序完成.已知木工做一张甲、乙型桌子分别需要1小时和2小时,漆工油漆一张甲、乙型桌子分别需要3小时和1小时,又木工、漆工每天工作分别不得超过8小时和9小时,而家具厂制造一张甲、乙型桌子分别获利润20元和30元.试问家具厂可获得的最大利润是(  )元.

    A.130

    B.110

    C.150

    D.120

    开始考试点击查看答案
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