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已知抛物線y2=8x,過點p(1,1)引一條弦,是此弦在p點別平分.求弦所在直線方程. 設直線方程y-1=k(x-1) 代入抛物線方程化成關於x的二次方程 令x1+x2=2 的k值 即可求得直線方程
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