余数问题求教--狒狒6-6

cheekar

6、If x and y are integers and xy<>0, what is the remainder when x is divided by y?

(1) when x is divided by 2y, the remainder is 4;

(2) when x+y is divided by y, the remainder is 4;

 

【答案】B

【思路】（1）X=2Y*K+4 举反例：当Y=4，X=4时，X/Y的余数为0。当Y=3，X=10时,X/Y的余数为1. (2)X+Y=Y*K+4 则X=(K-1)Y+4, 所以X/Y的余数为4

 

 

有点想不通，如果说（1）Y=4,X=4,余数为0，那么（2）举反例时也可以Y=4,X=4.余数为0，所以应该是E啊，想不通啊想不通，请明白的筒子赐教呵～～

yubyuber

x,y是不同的整数 吧？

Fabulous

这是狒狒6里的原题，我也不明白，直接忽略掉这个条件了

xionghuixh

楼主反例举的不妥，if y=x=4, how can u say when x+y is divided by 4,remainder is 4??