计算:(x的平方-y的平方)/(x+y)=?

问题描述:

计算:(x的平方-y的平方)/(x+y)=?

x-y为什么?怎么算的(x的平方-y的平方)/(x+y)=(x+y)(x-y)/(x+y)=x-y你再算一下这题:(a²-b²)/(a-b)=a+b还有:(3x²y-2xy²)/M=-3x+2,M等于多少?1、((a+b)²-(a-b))/(a+b)=?2、____/3x²y=2x-xy²+13、一个长方形的面积为a²-2ab+a,宽为a,则长方形的长为______我很感谢了!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!1