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(3分)(2011?重庆)设m,k为整数,方程mx 2﹣kx+2=0在区间(0,1)内有两个不同的根,则m+k的最小值为(        )

发布时间:2021-07-19

A.﹣8

B.8

C.12

D.13

试卷相关题目

  • 1已知点 http://picflow.koolearn.com/upload/papers/20140824/20140824051529317745.pnghttp://picflow.koolearn.com/upload/papers/20140824/20140824051529349722.png的坐标满足不等式组 http://picflow.koolearn.com/upload/papers/20140824/201408240515293801310.png,若 http://picflow.koolearn.com/upload/papers/20140824/20140824051529395534.png,则 http://picflow.koolearn.com/upload/papers/20140824/20140824051529427599.png的 取值范围是(    )

    A.http://picflow.koolearn.com/upload/papers/20140824/20140824051529442398.png

    B.http://picflow.koolearn.com/upload/papers/20140824/20140824051529458383.png

    C.http://picflow.koolearn.com/upload/papers/20140824/20140824051529489399.png

    D.http://picflow.koolearn.com/upload/papers/20140824/20140824051529551366.png

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  • 2若实数 http://picflow.koolearn.com/upload/papers/20140824/20140824043018173430.png满足 http://picflow.koolearn.com/upload/papers/20140824/20140824043018189755.png,且使关于 http://picflow.koolearn.com/upload/papers/20140824/20140824043018204278.png的方程 http://picflow.koolearn.com/upload/papers/20140824/20140824043018220734.pnghttp://picflow.koolearn.com/upload/papers/20140824/20140824043018235737.png均有实数根,则 http://picflow.koolearn.com/upload/papers/20140824/20140824043018235527.png有(  )

    A.最小值2

    B.最小值3

    C.最大值http://picflow.koolearn.com/upload/papers/20140824/20140824043018251450.png

    D.最大值http://picflow.koolearn.com/upload/papers/20140824/20140824043018267460.png

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  • 3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/20140824/20140824045801620931.png,上的一个动点,则 http://picflow.koolearn.com/upload/papers/20140824/20140824045801635394.png· http://picflow.koolearn.com/upload/papers/20140824/20140824045801651483.png的取值范围是(  )

    A.[-1,0]

    B.[0,1]

    C.[0,2]

    D.[-1,2]

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  • 4已知不等式组 http://picflow.koolearn.com/upload/papers/20140824/201408240450163331169.png 表示的平面区域的面积等于 http://picflow.koolearn.com/upload/papers/20140824/20140824045016349266.png,则 http://picflow.koolearn.com/upload/papers/20140824/20140824045016364283.png的值为(   )

    A.http://picflow.koolearn.com/upload/papers/20140824/20140824045016380223.png

    B.http://picflow.koolearn.com/upload/papers/20140824/20140824045016396368.png

    C.http://picflow.koolearn.com/upload/papers/20140824/20140824045016411291.png

    D.http://picflow.koolearn.com/upload/papers/20140824/20140824045016427338.png

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  • 5在平面直角坐标系中,不等式组 http://picflow.koolearn.com/upload/papers/20140824/201408240455351351061.pnghttp://picflow.koolearn.com/upload/papers/20140824/20140824045535151283.png为常数)表示的平面区域的面积是9.那么实数 http://picflow.koolearn.com/upload/papers/20140824/20140824045535151283.png的值为(  )

    A.http://picflow.koolearn.com/upload/papers/20140824/20140824045535167468.png

    B.http://picflow.koolearn.com/upload/papers/20140824/20140824045535198483.png

    C.http://picflow.koolearn.com/upload/papers/20140824/20140824045535213271.png

    D.http://picflow.koolearn.com/upload/papers/20140824/20140824045535229206.png http://picflow.koolearn.com/upload/papers/20140824/201408240455352454000.png

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  • 6(2011?湖北)已知向量 http://picflow.koolearn.com/upload/papers/20140824/20140824051013479267.png=(x+z,3), http://picflow.koolearn.com/upload/papers/20140824/20140824051013495272.png=(2,y﹣z),且 http://picflow.koolearn.com/upload/papers/20140824/20140824051013479267.pnghttp://picflow.koolearn.com/upload/papers/20140824/20140824051013542271.png,若x,y满足不等式|x|+|y|≤1,则z的取值范围为(  )

    A.[﹣2,2]

    B.[﹣2,3]

    C.[﹣3,2]

    D.[﹣3,3]

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  • 7已知 http://picflow.koolearn.com/upload/papers/20140824/20140824045525822499.png满足 http://picflow.koolearn.com/upload/papers/20140824/201408240455258381144.png,且 http://picflow.koolearn.com/upload/papers/20140824/20140824045525853483.png的最大值不小于6,则实数m的取值范围是(   )

    A.http://picflow.koolearn.com/upload/papers/20140824/20140824045525869503.png

    B.http://picflow.koolearn.com/upload/papers/20140824/20140824045525885529.png

    C.http://picflow.koolearn.com/upload/papers/20140824/20140824045525916622.png

    D.http://picflow.koolearn.com/upload/papers/20140824/20140824045525931622.png

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  • 8设变量x,y满足约束条件 http://picflow.koolearn.com/upload/papers/20140824/201408240512340041001.png,则z=x-3y的最大值为(   )

    A.http://picflow.koolearn.com/upload/papers/20140824/20140824051234020257.png

    B.4

    C.3

    D.http://picflow.koolearn.com/upload/papers/20140824/20140824051234036300.png

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  • 9实数x,y满足 http://picflow.koolearn.com/upload/papers/20140824/201408240505261111036.png,若目标函数z=x+y取得最大值4,则实数a的值为(  )

    A.4

    B.3

    C.2

    D.http://picflow.koolearn.com/upload/papers/20140824/20140824050526127388.png

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  • 10设x,y满足约束条件 http://picflow.koolearn.com/upload/papers/20140824/201408240444529761092.png,若目标函数z=ax+by(a>0,b>0)的最大值为12,则 http://picflow.koolearn.com/upload/papers/20140824/20140824044452991642.png的最小值为(   )

    A.http://picflow.koolearn.com/upload/papers/20140824/20140824044453007374.png

    B.http://picflow.koolearn.com/upload/papers/20140824/20140824044453007438.png

    C.1

    D.2

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