若椭圆x2a2+y2b2=1（a＞b＞0）的离心率为12，则双曲线x2a2-y2b2=1的渐近线方程为

题干

若椭圆

x

2

a

2

+

y

2

b

2

=1（a＞b＞0）的离心率为

1

2

，则双曲线

x

2

a

2

-

y

2

b

2

=1的渐近线方程为（　　）

A：y=± $\frac{\sqrt{3}}{2}$ x

B：y=± $\sqrt{3}$ x

C：y=± $\frac{1}{2}$ x

D：y=±x

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A

Name	Li Mei
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