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已知点P(x,y)的坐标满足条件http://picflow.koolearn.com/upload/papers/g02/20120829/201208290850033552809.png,则x+2y的最大值为 

发布时间:2021-07-16

A.3

B.6

C.8

D.7

试卷相关题目

  • 1已知点P(x,y)在由不等式组http://picflow.koolearn.com/upload/papers/g02/20120827/201208270757583043575.png确定的平面区域内,O为坐标原点,点A(﹣1,2),则|http://picflow.koolearn.com/upload/papers/g02/20120827/20120827075758335700.png|cos∠AOP的最大值是

    A.﹣http://picflow.koolearn.com/upload/papers/g02/20120827/201208270757583671004.png

    B.http://picflow.koolearn.com/upload/papers/g02/20120827/201208270757583971285.png

    C.1

    D.http://picflow.koolearn.com/upload/papers/g02/20120827/20120827075758427748.png

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  • 2如果不等式组http://picflow.koolearn.com/upload/papers/g02/20120829/201208291323479063293.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/g02/20120829/201208291323479301393.png

    B.http://picflow.koolearn.com/upload/papers/g02/20120829/201208291323479541415.png

    C.http://picflow.koolearn.com/upload/papers/g02/20120829/201208291323479791443.png

    D.http://picflow.koolearn.com/upload/papers/g02/20120829/201208291323480031436.png

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  • 3设不等式组http://picflow.koolearn.com/upload/papers/g02/20120816/201208161258048684971.png表示的平面区域为D,若指数函数 y=ax 的图象上存在区域D上的点,则a的取值范围是

    A.(1,3]

    B.[2,3]

    C.(1,2]

    D.[3,+∞]

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  • 4已知正数x、y满足http://picflow.koolearn.com/upload/papers/g02/20120306/201203061147511181127.gif,则z=22x+y的最大值为

    A.8

    B.16

    C.32

    D.64

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  • 5已知实数x,y满足约束条件http://picflow.koolearn.com/upload/papers/g02/20120207/201202071010348261152.gif,则z=2x+4y的最大值为

    A.24

    B.20

    C.16

    D.12

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  • 6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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  • 7若x,y满足约束条件http://picflow.koolearn.com/upload/papers/g02/20120822/201208222041517383459.png,目标函数z=kx+2y仅在点(1,1)处取得最小值,则k的取值范围是

    A.(﹣1,2)

    B.(﹣4,2)

    C.(﹣4,0]

    D.(﹣2,4)

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  • 8在平面直角坐标系中,不等式组http://picflow.koolearn.com/upload/papers/g02/20120818/201208181703513123476.png,表示的平面区域的面积是http://picflow.koolearn.com/upload/papers/g02/20120818/2012081817035169416354.png

    A.http://picflow.koolearn.com/upload/papers/g02/20120818/20120818170351739942.png

    B.4

    C.http://picflow.koolearn.com/upload/papers/g02/20120818/20120818170351783930.png

    D.2

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  • 9若A为不等式组http://picflow.koolearn.com/upload/papers/g02/20120817/201208171542441952622.png表示的平面区域,则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/g02/20120817/20120817154244239973.png

    B.http://picflow.koolearn.com/upload/papers/g02/20120817/20120817154244284959.png

    C.http://picflow.koolearn.com/upload/papers/g02/20120817/20120817154244330592.png

    D.http://picflow.koolearn.com/upload/papers/g02/20120817/20120817154244374594.png

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  • 10如果直线y=kx+1与圆x2+y2+kx+my-4=0交于M、N两点,且M、N关于直线x+y=0对称,则不等式组http://picflow.koolearn.com/upload/papers/g02/20120821/201208211410498251052.png表示的平面区域的面积是

    A.http://picflow.koolearn.com/upload/papers/g02/20120821/20120821141050203277.png

    B.http://picflow.koolearn.com/upload/papers/g02/20120821/20120821141051414280.png

    C.1

    D.2

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