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已知实数x、y满足http://picflow.koolearn.com/upload/papers/g02/20120831/201208312110022363241.png,则2x+y的最小值是

发布时间:2021-07-19

A.﹣3

B.﹣2

C.2

D.1

试卷相关题目

  • 1二元一次不等式组http://picflow.koolearn.com/upload/papers/g02/20120902/201209021915391823020.png 所表示的平面区域与圆面x2+(y﹣2)2≤2相交的公共区域的面积为 

    A.http://picflow.koolearn.com/upload/papers/g02/20120902/20120902191539217890.png

    B.http://picflow.koolearn.com/upload/papers/g02/20120902/20120902191539251866.png

    C.http://picflow.koolearn.com/upload/papers/g02/20120902/20120902191539285882.png

    D.π

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  • 2http://picflow.koolearn.com/upload/papers/g02/20120902/201209021916499193284.png,用Z=x+2y的最大值是3,则a的值是

    A.1

    B.﹣1

    C.3

    D.2

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  • 3已知O是坐标原点,点A(1,2),若点M(x,y)为平面区域http://picflow.koolearn.com/upload/papers/g02/20120918/201209181644262573506.png上的一个动点,则http://picflow.koolearn.com/upload/papers/g02/20120918/201209181644266231258.png的最大值是

    A.﹣1

    B.http://picflow.koolearn.com/upload/papers/g02/20120918/20120918164426907582.png

    C.2

    D.1

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  • 4已知x,y满足http://picflow.koolearn.com/upload/papers/g02/20120820/201208200850282783115.png则2x﹣y的取值范围是

    A.[﹣6,0]

    B.[﹣5,﹣1]

    C.[﹣6,﹣1]

    D.[﹣5,0]

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  • 5已知变量x,y满足约束条件http://picflow.koolearn.com/upload/papers/g02/20120707/201207071039083612336.png,则http://picflow.koolearn.com/upload/papers/g02/20120707/201207071039083951006.png的最小值为

    A.3

    B.1

    C.-5

    D.-6

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  • 6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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  • 7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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  • 8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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  • 9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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  • 10http://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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