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x^2+y^2-2x-4y=0 (x-1)^2+(y-2)^2=5 圓心(1,2) 直線l將圓平分 所以直線過原心 y-2=k(x-1) 不過第四現象 則k>=0且直線在y軸的截距>=0 x=0 y-2=-k y=2-k>=0 k
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