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设P(x,y)是图中的四边形内的点或四边形边界上的点,则z=2x+y的最大值是http://picflow.koolearn.com/upload/papers/g02/20120916/201209162002332646017.png

发布时间:2021-07-19

A.﹣2

B.﹣1

C.1

D.2

试卷相关题目

  • 1http://picflow.koolearn.com/upload/papers/g02/20120915/201209151559599596505.png,则A∩B所表示的平面图形的面积为

    A.http://picflow.koolearn.com/upload/papers/g02/20120915/201209151600000391145.png

    B.http://picflow.koolearn.com/upload/papers/g02/20120915/201209151600000931096.png

    C.http://picflow.koolearn.com/upload/papers/g02/20120915/201209151600001481078.png

    D.http://picflow.koolearn.com/upload/papers/g02/20120915/20120915160000216874.png

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  • 2设变量x,y满足约束条件http://picflow.koolearn.com/upload/papers/g02/20120917/201209171719397573579.png则目标函数z=2x+4y的最大值为

    A.10

    B.12

    C.13

    D.14

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  • 3已知方程x3+ax2+bx+c=0的三个实根可分别作为一椭圆,一双曲线、一抛物线的离心率,则a2+b2的取值范围是

    A.http://picflow.koolearn.com/upload/papers/g02/20120918/201209181146595421791.png

    B.http://picflow.koolearn.com/upload/papers/g02/20120918/201209181147003501707.png

    C.[5,+∞)

    D.(5,+∞)

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  • 4若A为不等式组http://picflow.koolearn.com/upload/papers/g02/20120824/201208241554017402948.png表示的平面区域,则当a从﹣2连续变化到1时,动直线x+y=a扫过A中的那部分区域的面积为

    A.http://picflow.koolearn.com/upload/papers/g02/20120824/20120824155401855655.png

    B.1

    C.http://picflow.koolearn.com/upload/papers/g02/20120824/20120824155401971624.png

    D.2

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  • 5某企业生产甲、乙两种产品.已知生产每吨甲产品要用A原料3吨、B原料2吨;生产每吨乙产品要用A原料1吨、B原料3吨.销售每吨甲产品可获得利润5万元、每吨乙产品可获得利润3万元.该企业在一个生产周期内消耗A原料不超过13吨、B原料不超过18吨,那么该企业可获得最大利润是  

    A.12万元

    B.20万元

    C.25万元

    D.27万元

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  • 6设变量x,y满足约束条件http://picflow.koolearn.com/upload/papers/g02/20120704/201207041334205252922.png则目标函数z=3x-y的取值范围是  

    A.http://picflow.koolearn.com/upload/papers/g02/20120704/201207041334205491045.png

    B.http://picflow.koolearn.com/upload/papers/g02/20120704/201207041334205741010.png

    C.[-1,6]

    D.http://picflow.koolearn.com/upload/papers/g02/20120704/201207041334205981047.png

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  • 7不等式http://picflow.koolearn.com/upload/papers/g02/20120820/201208202232373311220.png表示的平面区域在直线http://picflow.koolearn.com/upload/papers/g02/20120820/201208202232375591177.png

    A.左上方

    B.左下方

    C.右上方

    D.右下方

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  • 8如图,目标函数P=ax+y仅在封闭区域OACB内(包括边界)的点http://picflow.koolearn.com/upload/papers/g02/20120730/20120730144856859951.png处取得最大值,则a的取值范围是http://picflow.koolearn.com/upload/papers/g02/20120730/201207301448572498060.png

    A.http://picflow.koolearn.com/upload/papers/g02/20120730/20120730144857339931.png

    B.http://picflow.koolearn.com/upload/papers/g02/20120730/20120730144857420946.png

    C.http://picflow.koolearn.com/upload/papers/g02/20120730/20120730144857499910.png

    D.http://picflow.koolearn.com/upload/papers/g02/20120730/20120730144857596926.png

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  • 9若D为不等式组http://picflow.koolearn.com/upload/papers/g02/20120626/201206262154585802795.png表示的平面区域,则当http://picflow.koolearn.com/upload/papers/g02/20120626/20120626215458683392.pnghttp://picflow.koolearn.com/upload/papers/g02/20120626/20120626215458795492.png连续变化到1时,动直线http://picflow.koolearn.com/upload/papers/g02/20120626/201206262154589111072.png扫过D中的那部分区域的面积为 

    A.http://picflow.koolearn.com/upload/papers/g02/20120626/20120626215459014679.png

    B.http://picflow.koolearn.com/upload/papers/g02/20120626/20120626215459125664.png

    C.1

    D.5

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  • 10如果实数x,y满足:http://picflow.koolearn.com/upload/papers/g02/20120818/201208181027452673290.png,则目标函数z=4x+y的最大值为

    A.2

    B.3

    C.http://picflow.koolearn.com/upload/papers/g02/20120818/20120818102745323582.png

    D.4

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