已知点 F1、F2 分别为双曲线 x2a2−y2b2=1(a>0,b>0) 的左、右两个焦点，点 P 是双曲线右支上一点，若 P 点的横坐标 x0=43a 时，有 F1P⊥F2P ，则该双

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已知点 F1、F2 分别为双曲线

x

2

a

2

−

y

2

b

2

=1(a>0,b>0) 的左、右两个焦点，点 P 是双曲线右支上一点，若 P 点的横坐标 x0=

4

3

a 时，有 F1P⊥F2P ，则该双曲线的离心率 e 为( )

A： $\frac{3}{2} \sqrt{2}$

B： $\frac{3}{2}$

C：2

D： $\frac{9}{2}$

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A

同类题4

Tom was not old, but he did not have much hair. His wife, Grace, had thick, beautiful, black hair. They had one daughter. Her name was Jane, and she was four and a half years old. There was a photo of her father in the living-room, and a few days ago, Jane looked at it for a long time and then said to her mother, “Mummy, why had Dad got very little hair? ”
Grace laughed and said, “He’s got very little hair because he thinks a lot, Jane. He’ s a clever man.”
Jane looked at her mother’s thick, black hair for a few seconds（秒钟）, and then she asked, “Mum, why have you got a lot of hair? ”

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