摘要:与y轴相切.且和曲线x2+y2=4(0≤x≤2)相内切的动圆圆心的轨迹方程是 A.y2=2(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)

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