1、7(x+y)3-5(x+y)2-2(x+y)

问题描述:

1、7(x+y)3-5(x+y)2-2(x+y)
2/(x2+2x+3)(x2+2x+24)+90
3、x2-2xy+y2-5x+5y-6
4、x2+2xy-8y2+2x+14y-3
出现在字母、括号后的数字均为平方或立方,

1 =(x+y)(7(x+y)2-5(x+y)-2)=(x+y)(x+y-1)(7(x+y)+2)
2 =(x2+2x)2+27(x2+2x)+162=(x2+2x+18)(x2+2x+9)
3 =(x-y)2-5(x-y)-6=(x-y-6)(x-y+1)
抱歉,提供到这里