（xy-x^2)乘以(xy)/(x-y)= x(y-x)乘以（xy）/(x-y)= -x(x-y)乘以（xy）/(x-y)= -x^2y这样做对吗?

来源：学生作业帮助网 编辑：作业帮 时间：2024/04/30 07:48:40
（xy-x^2)乘以(xy)/(x-y)= x(y-x)乘以（xy）/(x-y)= -x(x-y)乘以（xy）/(x-y)= -x^2y这样做对吗?

（xy-x^2)乘以(xy)/(x-y)= x(y-x)乘以（xy）/(x-y)= -x(x-y)乘以（xy）/(x-y)= -x^2y这样做对吗?
（xy-x^2)乘以(xy)/(x-y)
= x(y-x)乘以（xy）/(x-y)
= -x(x-y)乘以（xy）/(x-y)
= -x^2y
这样做对吗?

（xy-x^2)乘以(xy)/(x-y)= x(y-x)乘以（xy）/(x-y)= -x(x-y)乘以（xy）/(x-y)= -x^2y这样做对吗?
对 .
前提是x不等于y

对