已知F1，F2是椭圆X225+y29=1的两个焦点，P是椭圆上的任意一点，则|PF1|•|PF2|的最大值是_刷题宝

题干

已知F₁，F₂是椭圆25

X

2

+

y

2

9

=1的两个焦点，P是椭圆上的任意一点，则|PF₁|•|PF₂|的最大值是（　　）

A：9

B：16

C：25

D： $\frac{25}{2}$

上一题下一题 0.0难度选择题更新时间:2019-09-11 09:13:57

答案(点此获取答案解析）

C

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