問題詳情
2. 已知 a, b, c 在數線上的位置如下: 
則 
的值等於:
(A) −a
(B) a
(C) 2c − a
(D) 2a − 2b
(E) 4
參考答案
答案：A
難度：適中0.5
統計：A(0),B(0),C(0),D(0),E(0)
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