8. 已知
,則 f (-7) 之值為何?
(A) - 28
(B) -14
(C)21
(D)35
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統計: A(2), B(2), C(18), D(0), E(0) #2031020
統計: A(2), B(2), C(18), D(0), E(0) #2031020