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标题: 有没有好方法 呢 ?这道题目 [打印本页]

作者: trifling    时间: 2006-3-19 14:11     标题: 有没有好方法 呢 ?这道题目

When 15n, where n is a positive integer, is divided by 6, the remainder is x. What is the value of x?

(1) When n is divided by 2, the remainder is 0.

(2) When n is divided by 3, the remainder is 0.

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.

有没有好方法 呢 ?

做是做对了 但是觉得方法不好 谢谢


作者: goodfishs    时间: 2006-3-20 07:27

选A吧

(1)知n为偶数,表示成n=2k,k为正整数,15n=15*2k=6*5k,所以15n/6=5k,余数为0

(2)不确定,比如n=3,45/6余数为3,n=6,余数为0


作者: trifling    时间: 2006-3-25 09:22

thanks  a  lot !!!!!!!!1




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