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设不等式组 http://picflow.koolearn.com/upload/papers/20140824/201408240347105031382.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(  ).

发布时间:2021-07-19

A.(1,3]

B.[2,3]

C.(1,2]

D.[3,+∞)

试卷相关题目

  • 1若实数 http://picflow.koolearn.com/upload/papers/20140824/20140824041747890403.png满足 http://picflow.koolearn.com/upload/papers/20140824/20140824041747905611.png,则 http://picflow.koolearn.com/upload/papers/20140824/20140824041747921610.png的取值范围是(  )

    A.http://picflow.koolearn.com/upload/papers/20140824/20140824041747937577.png

    B.http://picflow.koolearn.com/upload/papers/20140824/20140824041747952560.png

    C.http://picflow.koolearn.com/upload/papers/20140824/20140824041747968575.png

    D.http://picflow.koolearn.com/upload/papers/20140824/20140824041747968650.png

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  • 2已知点 http://picflow.koolearn.com/upload/papers/20140824/20140824042954851533.pnghttp://picflow.koolearn.com/upload/papers/20140824/20140824042954867514.png,直线 http://picflow.koolearn.com/upload/papers/20140824/20140824042954867650.pnghttp://picflow.koolearn.com/upload/papers/20140824/20140824042954898633.png与线段 http://picflow.koolearn.com/upload/papers/20140824/20140824042954898396.png相交,则 http://picflow.koolearn.com/upload/papers/20140824/20140824042954913629.png的最小值为(    )

    A.http://picflow.koolearn.com/upload/papers/20140824/20140824042954929452.png

    B.http://picflow.koolearn.com/upload/papers/20140824/20140824042954945370.png

    C.http://picflow.koolearn.com/upload/papers/20140824/20140824042954960483.png

    D.http://picflow.koolearn.com/upload/papers/20140824/20140824042954976346.png

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  • 3设关于x,y的不等式组 http://picflow.koolearn.com/upload/papers/20140824/201408240405534711179.png表示的平面区域内存在点P(x 0,y 0),满足x 0-2y 0=2.求得m的取值范围是(  )

    A.http://picflow.koolearn.com/upload/papers/20140824/20140824040553487746.png

    B.http://picflow.koolearn.com/upload/papers/20140824/20140824040553502727.png

    C.http://picflow.koolearn.com/upload/papers/20140824/20140824040553596776.png

    D.http://picflow.koolearn.com/upload/papers/20140824/20140824040553611768.png

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  • 4若关于 http://picflow.koolearn.com/upload/papers/20140824/20140824035441266266.pnghttp://picflow.koolearn.com/upload/papers/20140824/20140824035441281310.png的不等式组 http://picflow.koolearn.com/upload/papers/20140824/201408240354413131137.png表示的平面区域是一个三角形,则 http://picflow.koolearn.com/upload/papers/20140824/20140824035441328283.png的取值范围是(    )

    A.http://picflow.koolearn.com/upload/papers/20140824/20140824035441344392.png

    B.http://picflow.koolearn.com/upload/papers/20140824/20140824035441359405.png

    C.http://picflow.koolearn.com/upload/papers/20140824/20140824035441391486.png

    D.http://picflow.koolearn.com/upload/papers/20140824/20140824035441344392.pnghttp://picflow.koolearn.com/upload/papers/20140824/20140824035441359405.png

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  • 5若变量 http://picflow.koolearn.com/upload/papers/20140824/20140824040105604403.png满足约束条件 http://picflow.koolearn.com/upload/papers/20140824/20140824040105619939.png,则 http://picflow.koolearn.com/upload/papers/20140824/20140824040105635550.png的最大值是(   )

    A.2

    B.3

    C.4

    D.5

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  • 6某公司生产甲,乙两种桶装产品,已知生产甲产品1桶需耗A原料1千克,B原料2千克;生产乙产品1桶需耗A原料2千克,B原料1千克.每桶甲产品的利润是300元,每桶乙产品的利润是400元.公司在生产这两种产品的计划中,要求每天消耗A,B原料都不超过12千克.通过合理安排生产计划,从每天生产的甲,乙两种产品中,公司可获得的最大利润是(  )

    A.2200元

    B.2400元

    C.2600元

    D.2800元

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  • 7变量 http://picflow.koolearn.com/upload/papers/20140824/20140824040055947432.png满足约束条件 http://picflow.koolearn.com/upload/papers/20140824/201408240400559781041.png,若使 http://picflow.koolearn.com/upload/papers/20140824/20140824040055994528.png取得最大值的最优解有无数个,则实数 http://picflow.koolearn.com/upload/papers/20140824/20140824040056072283.png的取值集合是(      )

    A.http://picflow.koolearn.com/upload/papers/20140824/20140824040056088495.png

    B.http://picflow.koolearn.com/upload/papers/20140824/20140824040056134461.png

    C.http://picflow.koolearn.com/upload/papers/20140824/20140824040056150440.png

    D.http://picflow.koolearn.com/upload/papers/20140824/20140824040056166520.png

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  • 8已知点A(a,b)与点B(1,0)在直线3x-4y+10=0的两侧,给出下列说法: ①3a-4b+10>0; ②当a>0时,a+b有最小值,无最大值; ③ http://picflow.koolearn.com/upload/papers/20140824/20140824035622900544.png>2; ④当a>0且a≠1,b>0时, http://picflow.koolearn.com/upload/papers/20140824/20140824035622916456.png的取值范围为 http://picflow.koolearn.com/upload/papers/20140824/20140824035622947758.pnghttp://picflow.koolearn.com/upload/papers/20140824/20140824035622962767.png. 其中正确的个数是(    )

    A.1

    B.2

    C.3

    D.4

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  • 9设变量x.y满足约束条件 http://picflow.koolearn.com/upload/papers/20140824/201408240402204531266.png则目标函数 http://picflow.koolearn.com/upload/papers/20140824/20140824040220453605.png的最大值和最小值分别为(   )

    A.3,一11

    B.-3,一11

    C.11,—3

    D.11,3

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  • 10已知实数 x, y满足不等式组 http://picflow.koolearn.com/upload/papers/20140824/201408240350519141222.png则2 x- y+3的最小值是(  )

    A.3

    B.4

    C.6

    D.9

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