Question

分解因式：①x^3+2x^2-2x-4②xy+2x+y+2③6ab+4a+9b+6④6at+3bt-2as-bs

记得写过程

Answer 1

1 =x(x^2-2)+2(x^2-2)
=(x^2-2)(x+2)
2 =y(x+1)+2(x+1)
=(x+1)(y+2)
3 =2a(3b+2)+3(3b+2)
=(3b+2)(2a+3)
4 =3t(2a+b)-s(2a+b)
=(2a+b)(3t-s)