化简:(x-y)(x-2y)+(x+2y)(x-3y)
来源:学生作业帮助网 编辑:作业帮 时间:2024/06/23 02:31:47
![化简:(x-y)(x-2y)+(x+2y)(x-3y)](/uploads/image/z/2743198-70-8.jpg?t=%E5%8C%96%E7%AE%80%3A%28x-y%29%28x-2y%29%2B%28x%2B2y%29%28x-3y%29)
化简:(x-y)(x-2y)+(x+2y)(x-3y)
化简:(x-y)(x-2y)+(x+2y)(x-3y)
化简:(x-y)(x-2y)+(x+2y)(x-3y)
(x-y)(x-2y)+(x+2y)(x-3y)
=x^2-2xy-xy+2y^2+x^2-3xy+2xy-6y^2
=2x^2-4xy-4y^2.
拆开就行了啊
(x-y)(x-2y)+(x+2y)(x-3y)
= xx-3xy+2yy + xx-xy-6yy
= 2xx - 4xy - 4yy
= 2(xx - 2xy - 2yy)