GWD 24-35找不到以前的讨论请救命

wybcstacey · 发表于 2008-9-7 08:26:00

What is the value of x^2yz+xy^2z+xyz^2

(1) x+y+z=18

(2) xyz=10

l Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient

l Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient

l BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.

l EACH statement ALONE is sufficient

l Statements (1) and (2) TOGETHER are NOT sufficient

Answer C

实在想不明白，请NN们帮帮忙！

cjwbhu · 发表于 2008-9-7 08:41:00

mm是不是这道题的结构没看清楚？我刚刚也被误导了，应该是(x^2)yz+x(y^2)z+xy(z^2),提公因式xyz=xyz（x+y+z)
所以是答案c

shaketiger · 发表于 2008-9-7 08:43:00

原式=xyz（x+y+z)

不就是C吗？

wybcstacey · 发表于 2008-9-7 14:03:00

多谢2楼的美眉提醒，我确实是没看懂题目的结构，还在想现在的数学怎么这么变态。现在懂了。也谢谢3楼的哥哥！

所属分类: GMAT考试