请教狒狒数学宝典中的一题。。先谢过

ore612

 费费中的一题。。答案选B  。  请教具体解法。。谢谢。。。。

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;