若双曲线 x2a2−y2b2 =1（a＞0，b＞0）的一个焦点到一条渐近线的距离等于焦距的 14 ，则该双曲线的离心率为

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若双曲线

x

2

a

2

−

y

2

b

2

=1（a＞0，b＞0）的一个焦点到一条渐近线的距离等于焦距的

1

4

，则该双曲线的离心率为（）

A： $\frac{\sqrt{2}}{3}$

B： $\frac{2 \sqrt{2}}{3}$

C： $\frac{\sqrt{2}}{4}$

D： $\frac{2 \sqrt{3}}{3}$

上一题下一题 0.0难度选择题更新时间:2013-06-04 12:25:47

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D

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