(x-y)²-2y(x+y)怎么化简
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/01 06:16:30
![(x-y)²-2y(x+y)怎么化简](/uploads/image/z/1064315-11-5.jpg?t=%EF%BC%88x-y%EF%BC%89%26%23178%3B-2y%EF%BC%88x%2By%EF%BC%89%E6%80%8E%E4%B9%88%E5%8C%96%E7%AE%80)
(x-y)²-2y(x+y)怎么化简
(x-y)²-2y(x+y)怎么化简
(x-y)²-2y(x+y)怎么化简
(x-y)²-2y(x+y)=x²-2xy+y²-2xy-2y²=x²-4xy-y²=x²-4xy+4y²-5y²=(x-2y)²-5y²=(x-2y+根5)*(x-2y-根5)
x-y)/(2x+2y)
=(x-y)/2(x+y)
=(x-y)(x+y)/2(x+y)^2
xy/(x+y)^2
=2xy/2(x+y)^2
x - y/2x + 2y
=(x^2-y+4xy)/2x
=(x^2-y+4xy)(x+y)^2/2x(x+y)^2
xy/(x+y)^2
=2x^2y/2x(x+y)^2
展开就可以了。
(x-y)²-2y(x+y)
=x²-2xy+y²-2xy-2y²
=x²-4xy-y²