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解: 因為圓與直線相切, 則圓心到直線的距離就是半徑: D=|-2+2-5|/根號(1+4) =根號5 所以所求的圓的方程是: (x+1)^2+(y-2)^2=5 標準方程是: x^2+2x+y^2-4y=0
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