设A、B两点的坐标分别是(2,0)、(-2,0),若kMA·kMB=-1,则动点M的轨迹方程是

AB两点的坐标分别是(2,0)、(-2,0),若kMA·kMB=-1,则动点M的轨迹方程是(  )

A.x2+y2=4

B.x2+y2=4(x≠±2)

C.x2+y2=4(x≠±1)

D.x2+y2=1(x≠±1)

答案

解析

:设M的坐标为(x,y),则,即x2+y2=4(x≠±2).

答案

:B

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