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已知a<0,-1<b<0,则有( ) A.ab>ab2>a B.ab2>ab>a...
已知a<0,-1<b<0,则有( )
A.ab>ab2>a
B.ab2>ab>a
C.ab>a>ab2
D.a>ab>ab2
考点分析:
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的最小值是( )
A.3
B.
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C.
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D.1
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“|x|<1”是“-3<x<1”成立的( )条件.
A.既不充分也不必要
B.充要
C.必要不充分
D.充分不必要
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要得到函数
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的图象可将y=sin2x的图象( )
A.向右平移
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B.向左平移
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C.向右平移
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已知
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,则
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=( )
A.(3,-1)
B.(-3,-1)
C.(3,1)
D.(-3,1)
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