2x^2-3xy-2y^2=0,怎么变成(2x+y)(x-2y)=0
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/04 18:36:16
![2x^2-3xy-2y^2=0,怎么变成(2x+y)(x-2y)=0](/uploads/image/z/5257441-1-1.jpg?t=2x%5E2-3xy-2y%5E2%3D0%2C%E6%80%8E%E4%B9%88%E5%8F%98%E6%88%90%282x%2By%29%28x-2y%29%3D0)
2x^2-3xy-2y^2=0,怎么变成(2x+y)(x-2y)=0
2x^2-3xy-2y^2=0,怎么变成(2x+y)(x-2y)=0
2x^2-3xy-2y^2=0,怎么变成(2x+y)(x-2y)=0
交叉相乘法
1 -2
2 1
2*(-2)+1*1=-3
写的时候,按行来写,明白吗?这是简单方法.
2X^2-3xy-2y^2=2x^2-4xy+xy-2y^2=(2x^2-4xy)+(xy-2y^2)=2x(x-2y)+y(x-2y)=(x-2y)(2x+y)=0