Q34:The function f is defined by f(x) = - 1/x for all nonzero
numbers x. If f(a) = - 1/2 and f(ab)
= 1/6, then b =
A. 3
B. 1/3
C. - 1/3
D. -3
E. –12
答案d, 应为a.
If f(a) = - 1/2 and f(ab)
= 1/6------f(b)=-1/3 ----b=3-----A,
请指正。谢谢!
楼上错了,f(ab) = -1/ab = -1/a * 1/b = 1/6
-1/a= -1/2, b=-3
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