题目内容
f(x)满足f(a)+f(b)=f(ab),且f(2)=p,f(3)=q,则f(72)=( )
| A.p+q | B.3p+2q | C.2p+3q | D.p3+q2 |
f(72)=f(2×2×2×3×3)
=f(2)+f(2)+f(2)+f(3)+f(3)
=3p+2q.
故选B.
=f(2)+f(2)+f(2)+f(3)+f(3)
=3p+2q.
故选B.
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