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分析:3x+4y+12=0是一條直線;(x-1)^2+(y+1)^2=9是以(1,-1)為圓心,3為半徑的圓;這就是直線與圓的位置關係問題,只要比較圓心到直線的距離d與半徑r的大小關係即可.圓心到直線的距離d=(| 3*1+4*(-1)+12|)/根號下(3^…
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