试题与答案

已知F1,F2是椭圆x216+y29=1的两个焦点,过F2的直线交椭圆于点A,B

题型:选择题

题目:

已知F1,F2是椭圆
x2
16
+
y2
9
=1
的两个焦点,过F2的直线交椭圆于点A,B,若|AB|=5,则|AF1|-|BF2|等于(  )
A.3B.8C.13D.16

答案:

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