函数f(x)=ln(x2-2x)的单调递增区间是 .
考点分析:
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已知集合{a,b,c},则集合A的子集的个数为
.
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已知A,B,C是平面上不共线的三点,o为平面ABC内任一点,动点P满足等式
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且λ≠1,则P的轨迹一定通过△ABC的( )
A.内心
B.垂心
C.重心
D.外心
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设函数f(x)=
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x
3+
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x
2+tanθ,其中θ∈[0,
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],则导数f′(1)的取值范围是( )
A.[-2,2]
B.[
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,
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]
C.[
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,2]
D.[
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,2]
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已知向量
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,
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的夹角为
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,且
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,|
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|=2,在△ABC中,
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,D为BC边的中点,则
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=( )
A.2
B.4
C.6
D.8
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设f(x)=cosx-sinx把y=f(x)的图象向左平移φ个单位后,恰好得到函数y=f′(x)的图象,则φ的值可以为( )
A.
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B.
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C.π
D.
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