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

发布时间:2021-07-16

A.-4

B.-2

C.-1

试卷相关题目

  • 1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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  • 2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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  • 3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

    A.5

    B.4

    C.3

    D.2

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  • 4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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  • 5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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  • 6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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  • 7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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  • 8http://picflow.koolearn.com/upload/papers/g02/20120321/201203211632474871148.gif,则z=x-y的最大值是

    A.-1

    B.1

    C.2

    D.-2

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  • 9已知点P(x0,y0)和点A(1,2)在直线l:3x+2y-8=0的异侧,则

    A.3x0+2y0>0

    B.3x0+2y0<0

    C.3x0+2y0<8

    D.3x0+2y0>8

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  • 10已知O是坐标原点,点A(-1,1),若点M(x,y)为平面区域http://picflow.koolearn.com/upload/papers/g02/20111031/201110310928459061144.gif上的一个动点,则http://picflow.koolearn.com/upload/papers/g02/20120504/20120504111314571984.gif的最大值是

    A.-1

    B.3

    C.1

    D.2

    开始考试点击查看答案
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