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双曲线kx2+4y2=4k的离心率小于2,则k的取值范围是( ) A.(-∞,0...
双曲线kx2+4y2=4k的离心率小于2,则k的取值范围是( )
A.(-∞,0)
B.(-3,0)
C.(-12,0)
D.(-12,1)
考点分析:
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