which of the following can be expressed as the sum of three

问题描述:

which of the following can be expressed as the sum of three consecutive integers
A 17
B 23
C 25
D 30
E 40
1个回答 分类:数学 2014-11-05

问题解答:

我来补答
选D,看这个数能不能被3整除
你想啊,3个连续的整数,如果第一个是x的话,后面两个不就是x+1, x+2吗?
那x+x+1+x+2=3x+3=3(x+1)
 
 
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