5) (1+а^3)(1-а^3+а^6)=1+а^27
6)(4-n^2)(16+4n^2+n^4)=64-n^8
7) (25-5y^2+y^4)(5+y^2)=125+y^8
8) (64+8z^3+z^6)(8-z^3)=512-z^27
5) (1+а^3)(1-а^3+а^6)=1+а^27
6)(4-n^2)(16+4n^2+n^4)=64-n^8
7) (25-5y^2+y^4)(5+y^2)=125+y^8
8) (64+8z^3+z^6)(8-z^3)=512-z^27