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圓x2+y2-4x=0的圓心座標是(2,0),所以切點與圓心連線的斜率:3-01-2=-3,所以切線的斜率為:33,切線方程為:y-3=33(x-1),即x-3y+2=0.故答案為:x-3y+2=0.
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