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设点A(5,1),点B(x,y)满足约束条件http://picflow.koolearn.com/upload/papers/g02/20120214/201202141027596581213.gif,则http://picflow.koolearn.com/upload/papers/g02/20120214/20120214102759664951.gif的最大值为

发布时间:2021-07-16

A.5

B.4

C.3

D.2

试卷相关题目

  • 1如图,在平面直角坐标系中,Ω是一个与x轴的正半轴、y轴的正半轴分别相切于点C.D的定圆所围成的区域(含边界),

    B.C.D是该圆的四等分点.若点P(x,y)、点P′(x′,y′)满足x≤x′且y≥y′,则称P优于P′。如果Ω中的点Q满足:不存在Ω中的其它点优于Q,那么所有这样的点Q组成的集合是劣弧http://picflow.koolearn.com/upload/papers/g02/20120114/201201141125059841653.gif A.http://picflow.koolearn.com/upload/papers/g02/20120114/20120114112506000893.gif     B.http://picflow.koolearn.com/upload/papers/g02/20120114/20120114112506015891.gif C.http://picflow.koolearn.com/upload/papers/g02/20120114/20120114112506078896.gif D.http://picflow.koolearn.com/upload/papers/g02/20120114/20120114112506093894.gif

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  • 2已知点P(x,y)的坐标满足|x|+|y|≤1,那么2x+y的最小值是  

    A.-3

    B.-2

    C.-1

    D.2

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  • 3不等式组http://picflow.koolearn.com/upload/papers/g02/20120322/201203221354146991500.gif表示的平面区域的面积是

    A.4http://picflow.koolearn.com/upload/papers/g02/20120322/20120322135414709918.gif

    B.4

    C.2http://picflow.koolearn.com/upload/papers/g02/20120322/20120322135414721918.gif

    D.2

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  • 4已知x ,y 满足http://picflow.koolearn.com/upload/papers/g02/20120505/201205051135446851017.png,且目标函数z=3x+y的最小值是5,则z的最大值是

    A.10

    B.12

    C.14

    D.15

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  • 5已知实数x ,y满足http://picflow.koolearn.com/upload/papers/g02/20120508/201205081358192233372.png,则z=x+4y的最大值为

    A.9

    B.17

    C.5

    D.15

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  • 6给出平面区域如图所示,若使目标函数z=ax+y(a>0)取得最大值的最优解有无穷多个,则a的值为http://picflow.koolearn.com/upload/papers/g02/20120316/201203161145548752730.gif

    A.http://picflow.koolearn.com/upload/papers/g02/20120316/20120316114554881881.gif

    B.4

    C.http://picflow.koolearn.com/upload/papers/g02/20120316/20120316114554887879.gif

    D.http://picflow.koolearn.com/upload/papers/g02/20120316/20120316114554900878.gif

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  • 7已知O为坐标原点,点A(x,y)与点B关于x轴对称,http://picflow.koolearn.com/upload/papers/g02/20120314/20120314161739858848.gif=(0,1),则满足不等式http://picflow.koolearn.com/upload/papers/g02/20120314/201203141617398651029.gif的点A的集合用阴影表示为

    A.http://picflow.koolearn.com/upload/papers/g02/20120314/201203141617398721997.gif

    B.http://picflow.koolearn.com/upload/papers/g02/20120314/201203141617398782060.gif

    C.http://picflow.koolearn.com/upload/papers/g02/20120314/201203141617398852048.gif

    D.http://picflow.koolearn.com/upload/papers/g02/20120314/201203141617399032073.gif

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  • 8http://picflow.koolearn.com/upload/papers/g02/20120422/201204221333229831635.gif,若-2≤x≤2,-2≤y≤2,则z的最小值为

    A.-4

    B.-2

    C.-1

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  • 9已知O为坐标原点,A,B两点的坐标均满足不等式组http://picflow.koolearn.com/upload/papers/g02/20120507/201205071618450692875.png,则tan∠AOB的最大值等于

    A.http://picflow.koolearn.com/upload/papers/g02/20120507/20120507161845111552.png

    B.http://picflow.koolearn.com/upload/papers/g02/20120507/20120507161845153593.png

    C.http://picflow.koolearn.com/upload/papers/g02/20120507/20120507161845195590.png

    D.http://picflow.koolearn.com/upload/papers/g02/20120507/20120507161845239629.png

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  • 10已知点A(3,http://picflow.koolearn.com/upload/papers/g02/20111101/20111101133037750884.gif),O是坐标原点,点P(x,y)的坐标满足http://picflow.koolearn.com/upload/papers/g02/20111101/201111011330377811339.gif,设z为http://picflow.koolearn.com/upload/papers/g02/20120228/20120228160000418873.gifhttp://picflow.koolearn.com/upload/papers/g02/20120228/20120228160000425873.gif上的投影,则z的取值范围是

    A.[-3,3]

    B.[http://picflow.koolearn.com/upload/papers/g02/20120228/20120228155820599899.gifhttp://picflow.koolearn.com/upload/papers/g02/20111101/20111101133037875884.gif]

    C.[http://picflow.koolearn.com/upload/papers/g02/20120228/20120228155820605899.gif,3]

    D.[-3,http://picflow.koolearn.com/upload/papers/g02/20111101/20111101133037906884.gif]

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