因式分解2x方-4xy-y方

来源:学生作业帮助网 编辑:作业帮 时间:2024/05/06 00:10:55
因式分解2x方-4xy-y方

因式分解2x方-4xy-y方
因式分解2x方-4xy-y方

因式分解2x方-4xy-y方
是在实数范围内分解因式吗?
2x^2-4xy-y^2
=2(x^2-2xy+y^2)-3y^2
=[√2(x-y)]^2-(√3y)^2
=[√2(x-y)+√3y][√2(x-y)-√3y]
=[√2x+(√3-√2)x][√2x-(√3+√2)y].

2x-4xy+y =2x-4xy+2y-y =2(x-2xy+y)-y =2(x-y)-y =[(x-y)√2]-y =[(x-y)√2+y][(x-y)√2-y] =(x√2-y√2+y)(x√2-y√2-y)