GRR数学.when x+2 is divided by 5 the remainder is 3,the remain

GRR数学.when x+2 is divided by 5 the remainder is 3,the remainder when x is divided by 5
when x+2 is divided by 5 the remainder is 3,the remainder when x is divided by 5和2 的大小.
remainder是余数的意思,到底是（x+2）除以5的答案叫余数,还是没有除干净,多出了3?remainder在数学中有哪些意思?比如5-2,3就是remainder?