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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

发布时间:2021-07-19

A.[﹣6,0]

B.[﹣5,﹣1]

C.[﹣6,﹣1]

D.[﹣5,0]

试卷相关题目

  • 1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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  • 2设变量x、y满足http://picflow.koolearn.com/upload/papers/g02/20120823/201208231255435523720.png则目标函数z=2x+y的最小值为

    A.http://picflow.koolearn.com/upload/papers/g02/20120823/20120823125543584630.png

    B.2

    C.4

    D.6

    开始考试点击查看答案
  • 3在约束条件http://picflow.koolearn.com/upload/papers/g02/20120801/201208011630303081296.png下,目标函数z=2x+y的值

    A.有最大值2,无最小值

    B.有最小值2,无最大值

    C.有最小值http://picflow.koolearn.com/upload/papers/g02/20120801/20120801163030380580.png,最大值2

    D.既无最小值,也无最大值

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  • 4点(1,1)在下面各不等式表示的哪个区域中      

    A.http://picflow.koolearn.com/upload/papers/g02/20120708/201207081025369841099.png

    B.http://picflow.koolearn.com/upload/papers/g02/20120708/201207081025370111530.png

    C.http://picflow.koolearn.com/upload/papers/g02/20120708/20120708102537036905.png

    D.http://picflow.koolearn.com/upload/papers/g02/20120708/20120708102537063857.png

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  • 5若不等式组http://picflow.koolearn.com/upload/papers/g02/20120821/201208210752341633998.png表示的平面区域是一个四边形,则a的取值范围是 

    A.http://picflow.koolearn.com/upload/papers/g02/20120821/201208210752342201255.png

    B.0<a≤1

    C.http://picflow.koolearn.com/upload/papers/g02/20120821/201208210752342761632.png

    D.0<a≤1或http://picflow.koolearn.com/upload/papers/g02/20120821/201208210752343311255.png

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  • 6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

    开始考试点击查看答案
  • 7http://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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  • 8二元一次不等式组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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  • 9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

    A.﹣3

    B.﹣2

    C.2

    D.1

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  • 10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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