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?
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
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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