(x+y分之y)-(y²-x²分之xy)
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/02 05:42:40
![(x+y分之y)-(y²-x²分之xy)](/uploads/image/z/629311-31-1.jpg?t=%EF%BC%88x%2By%E5%88%86%E4%B9%8By%EF%BC%89-%EF%BC%88y%26%23178%3B-x%26%23178%3B%E5%88%86%E4%B9%8Bxy%29)
(x+y分之y)-(y²-x²分之xy)
(x+y分之y)-(y²-x²分之xy)
(x+y分之y)-(y²-x²分之xy)
=y/(x+y)+xy/(x+y)(x-y)
=[y(x-y)+xy]/(x+y)(x-y)
=(2xy-y²)/(x²-y²)
原式=y(y-x)/(y+x)(y-x)-xy(y+x)(y-x)
=(y²-xy-xy)(y+x)(y-x)
=(y²-2xy)(y+x)(y-x)