Question

把下列多项式分解因式

-4a^2b-6ab^2+8ab
3a(x-y)-6b(y-x)
忘了两个，补上。请各位帮帮忙！！
12s^t-20st^2
2a^4-6a^3-2a^2

Answer 1

-4a^2b-6ab^2+8ab
=-2ab(a+3b-4)

3a(x-y)-6b(y-x)
=3a(x-y)+6b(x-y)
=3(x-y)(a+2b)

追问

还有这些。请帮帮忙吧！！
12s^t-20st^2
2a^4-6a^3-2a^2

追答

12s^2t-20st^2
=4st(3s-5t)

2a^4-6a^3-2a^2
=2a^2(a^2-3a-1)