問題詳情
5. △ABC中，若a + c = 2b，3a + b = 2c，下列何者正確？
(A) a : b : c = -3 : -5 : -
(B) sinA : sinB : sinC = 3 : 5：
(C) 7ÐC = 60°
(D) sinA =
(E) cosB =
。
(A) a : b : c = -3 : -5 : -
(B) sinA : sinB : sinC = 3 : 5：
(C) 7ÐC = 60°
(D) sinA =
(E) cosB =
。
參考答案
答案：A,B,D,E
難度：適中0.5
統計：A(0),B(0),C(0),D(0),E(0)
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