t^3+3t^2+3t-3,分解因式,紧急情况,以下都是分解因式：1),abx^2-(a^2+b^2)x-(a^2-b^2)；2),x^9+x^6+X^3-3；3),a^3+b^3+c^3-3abc；4),x^5n+x^n+1；5),(x+y)(x+y+2xy)+(xy+1)(xy-1)
网友回答
abx^2-(a^2+b^2)x-(a^2-b^2)=(ax+a-b)*(bx-a-b)
x^9+x^6+x^3-3
=(x^9-1)+(x^6-1)+(x^3-1)
=(x^3-1)*(x^6+x^3+1)+(x^3+1)*(x^3-1)+(x^3-1)
=(x^3-1)*(x^6+2x^3+3)
=(x-1)*(x^2+x+1)*(x^6+2x^3+3)
很久不做是不行啊……