問題詳情
2. ( )設a, b都是無理數，c為有理數，以下何者必為無理數？
(A) a+c
(B) a-b
(C) a.c
(D) a.b
(E)
(A) a+c
(B) a-b
(C) a.c
(D) a.b
(E)
參考答案
答案：A[無官方正解]
難度：適中0.6
統計：A(3),B(0),C(1),D(0),E(1)
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