問題詳情
3.設△ABC是一個面積為5的直角三角形，∠B=90°，D、E分別在 
上且 
求DE之最小值為何？
(A)20/7
(B)12/7
(C)16/7
(D)18/7
上且 求DE之最小值為何？(A)20/7
(B)12/7
(C)16/7
(D)18/7
參考答案
答案：A
難度：適中0.424242
統計：A(14),B(5),C(7),D(1),E(0)
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