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化為y=(√(x+1)^2+(0-1)^2)+(√(x-2)^2+(0-2)^2) 轉化到直角坐標系中相當於點(x,0)到點A(-1,1)和點B(2,2)距離之和 找A關於x軸對稱點A1(-1,-1)A1B長度3√2即為最小值
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