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圓x^+y^-6x+5=0(x-3)^2+y^2=4 圓心座標(3,0)半徑r=2 直線x-my+3=0和圓x^+y^-6x+5=0 1當直線與圓相切時,圓心到直線的距離d=r d=|6|/√(1+m^2)=2 3=√(1+m^2) 9=1+m^2 m^2=8 m=±2√2
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