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已知函数f(x)=x3-3x2+1,g(x)=,则方程g[f(x)]-a=0(a...
已知函数f(x)=x
3-3x
2+1,g(x)=
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,则方程g[f(x)]-a=0(a为正实数)的根的个数不可能 为( )
A.3个
B.4个
C.5个
D.6个
考点分析:
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=(x
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=(x
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=x
1y
2-y
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2.已知平面向量
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,
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,
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,则下列说法错误的是( )
A.(
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⊙
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)+(
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⊙
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)=0
B.存在非零向量a,b同时满足
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=0且
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•
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=0
C.(
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+
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)⊙
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=
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⊙
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+
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⊙
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D.|
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⊙
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|
2=|
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|
2|
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|
2-|
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•
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|
2
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(a>0,b>0)的右焦点为F,左,右顶点分别为A
1,A
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1A
2为直径的圆上,则双曲线C的离心率为( )
A.
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B.2
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D.3
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