初二数学(因式分解)

1.2x(x+y)-5y(x+y)
= (x+y)(2x-5y)

2.(x+y)^2-(x+y);
=(x+y)(x+y-1)

3.a(x-y)+b(y-x);
=a(x-y)-b(x-y)
=(x-y)(a-b)

4.x^4(x+1)+x^2(x+1).
=x^2*(x+1)(x^2+1)

1.
=(x+y)(2x-5y)
2.
=(x+y)(x+y-1)
3.
=ax-ay+by-bx
=x(a-b)-y(a-b)
=(a-b)(x-y)
4.
=x平方(x+1)(x平方+1)

1.（2x-5y）(x+y)
2.（x+y-1）(x+y)
3.(a-b)(x+y)
4.x^2(x+1)(x^2+1)

(2x-5y)(x+y)
(x+y)(x+y-1)
(x-y)(a-b)
x^2(x+1)(x^2+1)

(2x-5y)(x+y)
(x+y)(x+y-1)
(a-b)(x-y)
x^2(x+1)[x^2(x+1)+1]

这也太简单了啊
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(2x-5y)(x+y)
(x+y)(x+y-1)
(a-b)(x-y)
x^2(x+1)[x^2(x+1)+1]
你也太小看知道上的人了吧