在椭圆+=1上取三点,其横坐标满足x1+x3=2x2,三点顺次与某一焦点连接的线段长是r1、r2、r3,则有( )
A.r1、r2、r3成等差数列 | B.r1、r2、r3成等比数列 |
C.、、成等差数列 | D.、、成等比数列 |
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在椭圆+=1上取三点,其横坐标满足x1+x3=2x2,三点顺次与某一焦点连接的线段长是r1、r2、r3,则有( )
A.r1、r2、r3成等差数列 | B.r1、r2、r3成等比数列 |
C.、、成等差数列 | D.、、成等比数列 |