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C:x8 +y8-8x+8=1配方得(x-8)8+y8=8,是以N(8,1)為圓心,以8為半徑的圓.設與直線x=-8和圓C相切的圓的圓心為M(x,y),則有x+8=√[(x-8)8+y8]-8.整理得:y8=88x.軌跡為頂點在原點,開口向右的抛物線.
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