問題詳情
28. 已知 f ( x )+g ( x )=7x+4,f ( x )-g ( x )=-3x+18,則 f ( 3 )=?
(A)15
(B)17
(C)19
(D)21
(A)15
(B)17
(C)19
(D)21
參考答案
無參考答案
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