公式法,提取公因式法,分组分解法,解方程法,还有十字相乘法不讲了可以用.如果是二次六项式还可以用待定系数法.
x^2-2xy+y^2-z^2=(x^2-2xy+y^2)-z^2=(x-y)^2-z^2=(x-y+z)(x-y-z)x^2-6x+5=(x^2-1)-(6x-6)=(x-1)(x+1)-6(x-1)=(x-1)(x+1-6)=(x-1)(x-5)x^2-6x+5=(x^2-x)-(5x-5)=x(x-1)-5(x-1)=(x-1)(x-5)把整式分成几组来分解因式.
x^4-x^3-x^2+x=(x^4-x^3)-(x^2-x)=x^3(x-1)-x(x-1)=(x^3-1)(x-1)=(x-1)(x^2+x+1)(x-1)=(x-1)^2(x^2+x+1)