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圓(x+2)2+y2=2的圓心為A(-2,0),半徑為2.…(2分)設動圓圓心為M(x,y),半徑為r.…(3分)由已知條件,知|MA|=r+2,|MB|=r,所以|MA|-|MB|=2,…(6分)所以點M的軌跡為以A、B為焦點的雙曲線的右支,…(8…
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