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标题: 请教一下两道题 [打印本页]

作者: XIAOXIANGXI 时间: 2006-7-28 07:00 标题: 请教一下两道题

请教一下这两个体的答案是怎么解出来的呢？

1， if (1/5)^m (1/4)^18 = 1/(2(10)^35) then m = ? 答案：35

2， if XY=1, what's the value of (2(x+y)^2)/(2(x-y)^2) ? 答案：16

多谢

作者: himba 时间: 2006-7-28 14:26

QUOTE:

1， if (1/5)^m (1/4)^18 = 1/(2(10)^35) then m = ? 答案：35

(1/5)^m (1/4)^18

=1/(5^m)*1/(2^36)

=1/[2(2^35)*(5^m)]

=1/(2(10)^35)

apparently, m=35

QUOTE:

2， if XY=1, what's the value of (2(x+y)^2)/(2(x-y)^2) ?

you can look up in GMAT-PREP讨论稿.

but as i know, there is something wrong in this question, so from the premise we have got we can not find the exact answer.

作者: XIAOXIANGXI 时间: 2006-7-30 16:35

pretty cool for the first one. Thanks!

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