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1轨迹为直线1.已知⊙O1与⊙O2半径相等且相离或相切,当⊙P与⊙O1、⊙O2都内切或都外切时,则动圆圆心P的轨迹是一条直线(或去掉一个点的一条直线);
1 The trajectory is a straight line 1. Known ⊙O1 and ⊙O2 have equal radii and are separated or tangent. When ⊙P and ⊙O1, ⊙O2 are both inscribed or both are circumscribed, the trajectory of circle center P is a straight line ( Or remove a point of a straight line);