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如圖, 若OP與所求的直線L不垂直.則垂線段OC<;OP, ∴ ;垂線段要最大(即O到直線距離最遠),則OP與直線L垂直 k(OP)=-1/2=-1/2 ∴ ;L的斜率是2 ∴ ;直線L的方程是y+1=2(x-2) 即 ;y=2x-5
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