求助：GWD18-Q6

lovereve · 发表于 2010-12-10 19:16:56

The function f is defined for each positive three-digit integer n by f(n) = 2^x3^y5^z, where x, y and z are the hundreds, tens, and units digits of n, respectively.If m and v are three-digit positive integers such that f(m) = 9 f(v), then m - v =

A.8

B.9

C.18

D.20

E.80

jbc88 · 发表于 2010-12-10 19:42:19

9=3^2 。所以 f(m) = （3^2） f(v),

M上的十位= Y+2 V的十位=Y

所以是20。我记得我当时是这么做的。

d。MAYBE I AM WRONG

lovereve · 发表于 2010-12-10 20:09:24

谢谢阿

jbc88 · 发表于 2010-12-10 20:13:59

谢谢阿

-- by 会员 lovereve (2010/12/10 20:09:24)

不谢~

求助：GWD18-Q6

所属分类: GMAT考试

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