問題詳情

1.在下列各函數中﹐何者之定義域不是全部實數所成的集合﹖　 
(A)f (x)= |x-3|　
(B)f(x) =

　
(C)f x) = (x-3)2 - 4　
(D)f (x) = x-3　
(E)f (x) =

參考答案

答案：A[無官方正解]
難度：適中0.5
統計：A(1),B(0),C(1),D(0),E(4)