求到直线x-y-1=0的距离为2的动点P的轨迹方程.rtrrrrrrrrrrrrrrrrrrr

问题描述:

求到直线x-y-1=0的距离为2的动点P的轨迹方程.
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x-y-1=2倍根号2或x-y-1=-2倍根号2