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已知,若方程f′(x)=0的两个实数根可以分别作为一个椭圆和双曲线的离心率,则(...
已知
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,若方程f′(x)=0的两个实数根可以分别作为一个椭圆和双曲线的离心率,则( )
A.a-b<-3
B.a-b≤-3
C.a-b>-3
D.a-b≥-3
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