1) -(a-b)(a²+ab+b²)
2) -(x-1/y)(x²+x/y+1/y²)
3) (a²+1)(a⁴-a²+1)
4) (xy-1)(x²y²+xy+1)
5) (mn+2)(m²n²-2mn+4)
6) -1/8(1+2a)(1-2a+4a²)
1) -(a-b)(a²+ab+b²)
2) -(x-1/y)(x²+x/y+1/y²)
3) (a²+1)(a⁴-a²+1)
4) (xy-1)(x²y²+xy+1)
5) (mn+2)(m²n²-2mn+4)
6) -1/8(1+2a)(1-2a+4a²)