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已知不等式ax2-5x+b>0的解集为{x|-3<x<2},则a+b为

发布时间:2021-07-20

A.2

B.3

C.-2

D.-3

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    A.a=1,b=2

    B.a=-1,b=-2

    C.a=1,b=-2

    D.不确定

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    B.http://picflow.koolearn.com/upload/papers/g02/20110829/20110829155926890978.gif

    C.http://picflow.koolearn.com/upload/papers/g02/20110829/201108291559268901138.gif

    D.http://picflow.koolearn.com/upload/papers/g02/20110829/20110829155926968978.gif

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  • 3若不等式0≤x2-ax+a≤1有唯一解,则a的取值为

    A.1

    B.2

    C.4

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  • 4在R上定义运算http://picflow.koolearn.com/upload/papers/g02/20110518/201105181125549121043.gif=ab+2a+b,则满足xhttp://picflow.koolearn.com/upload/papers/g02/20110518/20110518112554928890.gif(x-2)<0的实数x的取值范围为

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    C.(-∞,2)∪(1,+∞)

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    A.(0,http://picflow.koolearn.com/upload/papers/g02/20110815/20110815135523953959.gif

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  • 6对于任意实数x,不等式(a-2)x2-2(a-2)x-4<0恒成立,则实数a取值范围(  )

    A.(-∞,2)

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    A.(-∞,-1)∪(2,+∞)

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