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圓的方程配方得x^2+(y-4)^2=4,囙此圓心座標是(0,4),半徑r=2 .因為直線與圓相切,所以圓心到直線距離=半徑,即|2k+4|/√(k^2+1)=2,去分母並兩邊平方得4k^2+16k+16=4k^2+4,解得k=-3/4 .(本題中,直線過圓外定點…
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