問題詳情
3. ( ) 設ABC為坐標平面上一三角形, P為平面上一點, 且 
為
(A)
(B)
(C)
(D)
(E)
為(A)
(B)
(C)
(D)
(E)
參考答案
答案：E[無官方正解]
難度：非常困難0
統計：A(2),B(0),C(2),D(0),E(2)
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