和y轴相切,且和半圆x2+y2=4(0≤x≤2)相内切的动圆圆心P的轨迹方程是
A.y2=4(x-1)(0<x≤1) | B.y2=-4(x-1)(0<x≤1) |
C.y2=4(x+1)(0<x≤1) | D.y2=-2(x-1)(0<x≤1) |
推荐套卷
和y轴相切,且和半圆x2+y2=4(0≤x≤2)相内切的动圆圆心P的轨迹方程是
A.y2=4(x-1)(0<x≤1) | B.y2=-4(x-1)(0<x≤1) |
C.y2=4(x+1)(0<x≤1) | D.y2=-2(x-1)(0<x≤1) |