已知椭圆+=1和双曲线-=1有公共的焦点,那么双曲线的渐近线方程是( 

已知椭圆+=1和双曲线-=1有公共的焦点,那么双曲线的渐近线方程是(    )

A.x=±y        B.y=±x       C.x=±y          D.y=±x

答案

解:由双曲线方程判断出公共焦点在x轴上,

∴椭圆焦点(,0),双曲线焦点在x轴上.

∴椭圆焦点(,0),双曲线焦点(,0).

∴3m2-5n2=2m2+3n2,∴m2=8n2.

又∵双曲线渐近线为y=±x,

∴代入m2=8n2,即|m|=2n,得y=±x,故应选D.

答案:

D

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