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方程2x2-5x+2=0的两个根可分别作为( ) A.一椭圆和一双曲线的离心率 ...
方程2x2-5x+2=0的两个根可分别作为( )
A.一椭圆和一双曲线的离心率
B.两抛物线的离心率
C.一椭圆和一抛物线的离心率
D.两椭圆的离心率
考点分析:
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A.
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A.
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D.12
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