拆项
xy2+x2y+xz2+x2z+yz2+y2z+3xyz
=(xy+xz+yz)*(x+y+z)
x^4+4
=(x^2+2)^2-4x^2
=(x^2+2+2x)*(x^2+2-2x)
x^3-4x^2+x+6
=(x+1)*(x-3)*(x-2)
拆项
xy2+x2y+xz2+x2z+yz2+y2z+3xyz
=(xy+xz+yz)*(x+y+z)
x^4+4
=(x^2+2)^2-4x^2
=(x^2+2+2x)*(x^2+2-2x)
x^3-4x^2+x+6
=(x+1)*(x-3)*(x-2)