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已知变量x,y满足约束条件http://picflow.koolearn.com/upload/papers/g02/20120821/201208211706409883218.png,则z=2xhttp://picflow.koolearn.com/upload/papers/g02/20120821/20120821170641034171.png4y的最大值为

发布时间:2021-07-16

A.64

B.32

C.2

D.http://picflow.koolearn.com/upload/papers/g02/20120821/20120821170641078573.png

试卷相关题目

  • 1设变量x,y满足约束条件http://picflow.koolearn.com/upload/papers/g02/20120816/201208161810082073284.png则目标函数z=x+2y的最小值为

    A.2

    B.3

    C.5

    D.9

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  • 2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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  • 3已知变量x,y满足http://picflow.koolearn.com/upload/papers/g02/20120823/201208231602269601403.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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  • 4若不等式组http://picflow.koolearn.com/upload/papers/g02/20120821/201208210858010303885.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/g02/20120821/201208210858010961183.png

    B.0<a≦1

    C.http://picflow.koolearn.com/upload/papers/g02/20120821/201208210858011551493.png

    D.0<a≦1或http://picflow.koolearn.com/upload/papers/g02/20120821/201208210858012061183.png

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  • 5如果不等式组http://picflow.koolearn.com/upload/papers/g02/20120829/201208291951543543293.png表示的平面区域是一个直角三角形,则该三角形的面积为 

    A.http://picflow.koolearn.com/upload/papers/g02/20120829/201208291951543781393.png

    B.http://picflow.koolearn.com/upload/papers/g02/20120829/201208291951544021415.png

    C.http://picflow.koolearn.com/upload/papers/g02/20120829/201208291951544261443.png

    D.http://picflow.koolearn.com/upload/papers/g02/20120829/201208291951544501436.png

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  • 6设双曲线x2﹣y2=1的两条渐近线与直线x=http://picflow.koolearn.com/upload/papers/g02/20120827/201208270945073211042.png围成的三角形区域(包含边界)为E,P(x,y)为该区域内的一个动点,则目标函数z=3x﹣2y的取值范围为

    A.[http://picflow.koolearn.com/upload/papers/g02/20120827/201208270945073511409.png]

    B.[http://picflow.koolearn.com/upload/papers/g02/20120827/201208270945073812097.png]

    C.[http://picflow.koolearn.com/upload/papers/g02/20120827/201208270945074112090.png]

    D.[http://picflow.koolearn.com/upload/papers/g02/20120827/201208270945074411675.png]

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  • 7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

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  • 8设f(x)是定义在R上的增函数,且对于任意的x都有f(1﹣x)+f(1+x)=0恒成立.如果实数m、n满足不等式组http://picflow.koolearn.com/upload/papers/g02/20120822/201208221623472054400.png,那么m2+n2的取值范围是(  )  

    A.(3,7)

    B.(9,25)

    C.(13,49)

    D.(9,49)

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  • 9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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  • 10设变量x,y满足约束条件http://picflow.koolearn.com/upload/papers/g02/20120816/201208161542296964607.png,则目标函数z=2x+y的最大值为

    A.8

    B.13

    C.14

    D.10

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