Question

因式分解：2 (x^2)+x-1 16-8（x-y）+（x-y)^2 2（x^2)-4x+2 a^3-9a (x+y)^2-(x-y)^2

9(x^2)-y^2-4y-4 a^2-b^2+ac+bc 8(x^2-2y^2)-x(7x+y)+xy
急急急急急急急

Answer 1

解: 2x²+x-1
=(x+1)(2x-1)

16-8（x-y）+（x-y)²
=(x-y)²-8(x-y)+4²
=(x-y-4)²

2x²-4x+2
=2(x²-2x+1)
=2(x-1)²

a³-9a
=a(a²-9)
=a(a+3)(a-3)

(x+y)²-(x-y)²
=[(x+y)+(x-y)][(x+y)-(x-y)]
=(x+y+x-y)(x+y-x+y)
=2x(2y)
=4xy

9x²-y²-4y-4
=9x²-(y²+4y+4)
=(3x)²-(y+2)²
=(3x+y+2)(3x-y-2)

a²-b²+ac+bc
=(a+b)(a-b)+c(a+b)
=(a+b)(a-b+c)

8(x²-2y²)-x(7x+y)+xy
=8x²-16y²-7x²-xy+xy
=x²-16y²
=(x+4y)(x-4y)

祝你学习进步,如有不明可以追问.同意我的答案请采纳,O(∩_∩)O谢谢

Answer 2

中间内个是什么东西- - ^这个。