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(5分)(2011?广东)已知平面直角坐标系xOy上的区域D由不等式组 http://picflow.koolearn.com/upload/papers/20140824/201408240519058771400.png给定.若M(x,y)为D上的动点,点A的坐标为 http://picflow.koolearn.com/upload/papers/20140824/20140824051905986600.png,则z= http://picflow.koolearn.com/upload/papers/20140824/20140824051906002321.png? http://picflow.koolearn.com/upload/papers/20140824/20140824051906017328.png的最大值为(       )

发布时间:2021-07-19

A.3

B.4

C.3http://picflow.koolearn.com/upload/papers/20140824/20140824051906033416.png

D.4http://picflow.koolearn.com/upload/papers/20140824/20140824051906033416.png

试卷相关题目

  • 1http://picflow.koolearn.com/upload/papers/20140824/20140824043105628266.pnghttp://picflow.koolearn.com/upload/papers/20140824/20140824043105644310.png满足约束条件 http://picflow.koolearn.com/upload/papers/20140824/20140824043105675943.png,则 http://picflow.koolearn.com/upload/papers/20140824/20140824043105691544.png的取值范围是(   )

    A.http://picflow.koolearn.com/upload/papers/20140824/20140824043105706401.png

    B.http://picflow.koolearn.com/upload/papers/20140824/20140824043105722425.png

    C.http://picflow.koolearn.com/upload/papers/20140824/20140824043105769422.png

    D.http://picflow.koolearn.com/upload/papers/20140824/20140824043105769438.png

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  • 2已知正三角形 ABC的顶点 A(1,1), B(1,3),顶点 C在第一象限,若点( x, y)在△ ABC内部,则 z=- x+ y的取值范围是

    A.(1-http://picflow.koolearn.com/upload/papers/20140824/20140824042618775344.png,2)

    B.(0,2)

    C.(http://picflow.koolearn.com/upload/papers/20140824/20140824042618775344.png-1,2)

    D.(0,1+http://picflow.koolearn.com/upload/papers/20140824/20140824042618775344.png)

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  • 3设实数x,y满足 http://picflow.koolearn.com/upload/papers/20140824/20140824035342485860.png则点(x,y)在圆面x 2+y 2≤ http://picflow.koolearn.com/upload/papers/20140824/20140824035342500338.png内部的概率为(  )

    A.http://picflow.koolearn.com/upload/papers/20140824/20140824035342500423.png

    B.http://picflow.koolearn.com/upload/papers/20140824/20140824035342516396.png

    C.http://picflow.koolearn.com/upload/papers/20140824/20140824035342547474.png

    D.http://picflow.koolearn.com/upload/papers/20140824/20140824035342547421.png

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  • 4某运输公司有12名驾驶员和19名工人,有8辆载重为10吨的甲型卡车和7辆载重为6吨的乙型卡车.某天需运往A地至少72吨的货物,派用的每辆车需满载且只运送一次,派用的每辆甲型卡车需配2名工人,运送一次可得利润450元;派用的每辆乙型卡车需配1名工人,运送一次可得利润350元.该公司合理计划当天派用两类卡车的车辆数,可得最大利润z=(  )

    A.4650元

    B.4700元

    C.4900元

    D.5000元

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  • 5设 x, y满足约束条件 http://picflow.koolearn.com/upload/papers/20140824/201408240347591911059.png则 z=2 x-3 y的最小值是(  )

    A.-7

    B.-6

    C.-5

    D.-3

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  • 6若曲线 http://picflow.koolearn.com/upload/papers/20140824/20140824051546727466.png上存在点 http://picflow.koolearn.com/upload/papers/20140824/20140824051546743533.png满足约束条件 http://picflow.koolearn.com/upload/papers/20140824/201408240515467581110.png,则实数 http://picflow.koolearn.com/upload/papers/20140824/20140824051546789337.png的取值范围是(   )

    A.http://picflow.koolearn.com/upload/papers/20140824/20140824051546805397.png

    B.http://picflow.koolearn.com/upload/papers/20140824/20140824051546821509.png

    C.http://picflow.koolearn.com/upload/papers/20140824/20140824051546821566.png

    D.http://picflow.koolearn.com/upload/papers/20140824/20140824051546836526.png

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  • 7变量x,y满足约束条件 http://picflow.koolearn.com/upload/papers/20140824/201408240505312901109.png,则目标函数z=3x-y的取值范围是(  )

    A.[-http://picflow.koolearn.com/upload/papers/20140824/20140824050531290388.png,6]

    B.[-http://picflow.koolearn.com/upload/papers/20140824/20140824050531290388.png,-1]

    C.[-1,6]

    D.[-6,http://picflow.koolearn.com/upload/papers/20140824/20140824050531290388.png]

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  • 8设m>1,在约束条件 http://picflow.koolearn.com/upload/papers/20140824/20140824045804552967.png下,目标函数z=x+my的最大值小于2,则m的取值范围为(  )

    A.(1,1+http://picflow.koolearn.com/upload/papers/20140824/20140824045804584344.png)

    B.(1+http://picflow.koolearn.com/upload/papers/20140824/20140824045804584344.png,+∞)

    C.(1,3)

    D.(3,+∞)

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  • 9已知实数 http://picflow.koolearn.com/upload/papers/20140824/20140824050747167403.png满足 http://picflow.koolearn.com/upload/papers/20140824/20140824050747198811.pnghttp://picflow.koolearn.com/upload/papers/20140824/20140824050747213686.png的取值范围为(     )

    A.http://picflow.koolearn.com/upload/papers/20140824/20140824050747229525.png

    B.http://picflow.koolearn.com/upload/papers/20140824/20140824050747260829.png

    C.http://picflow.koolearn.com/upload/papers/20140824/20140824050747276564.png

    D.http://picflow.koolearn.com/upload/papers/20140824/20140824050747291841.png

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  • 10已知 http://picflow.koolearn.com/upload/papers/20140824/20140824045933410556.png是不等式组 http://picflow.koolearn.com/upload/papers/20140824/201408240459334411047.png表示的平面区域内的一点, http://picflow.koolearn.com/upload/papers/20140824/20140824045933473524.pnghttp://picflow.koolearn.com/upload/papers/20140824/20140824045933488296.png为坐标原点,则 http://picflow.koolearn.com/upload/papers/20140824/20140824045933504510.png的最大值(   )

    A.2

    B.3

    C.5

    D.6

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