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由題意有,複數z對應的點Z到(0,1)和(0,-1)的距離之和為2 ∴Z落在以複數i和-i對應的點為端點的線段上 ∴|z+1+i|=|z-(-1-i)|表示線段上點到(-1,-1)點的距離的最大最小值問題 畫出圖像,很容易得到最大值為√5,最小值為1
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