ChaseDream

标题: 这到GWD的答案是不是错了 [打印本页]

作者: scorpio2rd 时间: 2008-10-28 10:23
标题: 这到GWD的答案是不是错了

What is the remainder when the positive integer n is divided by the positive interger K, where k>1

(1) n=(k+1) ^3

(2) k = 5

Answer: A

我选C, 我决的A 不能成立呀... 当K = 2, 3, 4... 的时候... 余数是不一样的呀....

作者: scorpio2rd 时间: 2008-10-28 10:32

If vmt ≠ 0, is v²m³t^-4 > 0?

(1) m > v²

(2) m > t^-4

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

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

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

D. EACH statement ALONE is sufficient.

E. Statements (1) and (2) TOGETHER are NOT sufficient.

答案是E

我选D

(1) v^2>0, so m>0, sufficient

(2)t^-4 >0, so m>0, sufficient,

怎么答案是E呀...还是我有犯了什么愚蠢的错误呢......

作者: WEIBARBARA 时间: 2008-10-28 11:15

就应该是a 因为（k+1）的三次方。是 k^3+3k^2+3k+1

题中问{（k+1）^3 }/ k 的余数就等于（k^3+3k^2+3k+1）/　k 的余数。前边三个可以被k初，并且ｋ＞１．所以都余１。　代入　２，３，４　验证一样的。

作者: scorpio2rd 时间: 2008-10-28 13:04