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标题: GWD 17-16 [打印本页]

作者: casualwalk    时间: 2005-11-20 07:07     标题: GWD 17-16

Q16:The three-digit integer kss is the sum of the two-digit integers ks and rs, where k, r, and s are the digits of the integers. Which of the following must be true?

I. k = 2

II. r = 9

III. s = 5

A. I only

B. II only

C. III only

D. I and II

E. II and III

Answer: B

这题该怎么算比较好呀?


作者: rainyliu    时间: 2005-11-20 11:24

s只能的0因为只有0+0还等于0

而ks+rs=kss这个式子中两个两位数相加所得出的三位数百位上肯定是1

也就是说,kss=100, k=1,带到式子中可以推出r=9


作者: jhiiool    时间: 2005-11-20 21:04

ks+rs=kss 因为K在百位,S+S=S,所以,K=1,S=0,因此R=9






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