Question

demonstrati identitatile a³-b³=(a-b)(a²+ab+b²)  si    a³+b³+(a+b)(a²-ab+b²) oricare ar fi a,b ∈R

Answer 1

a=1
b=1 
deoarece poti inlocui identitatea cifrelor

Answer 2

$(a-b)( a^{2}+ab+b^{2})=a^{3}+a^{2}b+ab^{2}-ba^{2}-ab^{2}-b^{3}=a^{3}-b^{3}$