分解因式(x-y)(x平方+xy+y平方)-xy(y-x)

问题描述:

分解因式(x-y)(x平方+xy+y平方)-xy(y-x)

解释: 先看后面的,将它乘出来。就是-xy²+x²y,提取xy就是xy(x-y).这时候就会发现前面一项也有(x-y),就提出来,=(x-y)(xy+xy+x²+y²)=(x-y)(2xy+x²+y²).而根据公式a²+2ab+b²=(a+b)²,可得)(2xy+x²+y²)=(x+y)²,所以结果为(x-y)(x+y)²。这样就可以写了。
原式=(x-y)(x²+xy+y²)+xy(x-y)
=(x-y))(xy+xy+x²+y²)-----这步可以省
=(x-y)(2xy+x²+y²)
=(x-y)(x+y)²
有不懂得可以问我,419365095

=(x-y)(x²+xy+y²)+xy(x-y)
=(x-y)(x²+2xy+y²)
=(x-y)(x+y)²

(x-y)(x^2+xy+y^2)-xy(y-x)
原式=(x-y)(x^2+xy+y^2)+xy(x-y) ……改变符号
=(x-y)(x^2+2xy+y^2) ……提取公因式
=(x-y)(x+y)^2

(x-y)(x^2+xy+y^2)-xy(y-x)
原式=(x-y)(x^2+xy+y^2)+xy(x-y)
=(x-y)(x^2+2xy+y^2)
=(x-y)(x+y)^2