Question

Упростите выражение:
3a^3-81b^3                   +   81a^2*b-54ab^2+9b^3
18b^2*a+6a^2*b+2a^3        2ab^2-12ba^2+18a^3

Answer 1

$frac{3(a-3b)(a^{2}+3ab+9b^{2})}{2a(9b^{2}+3ab+a^{2})}+ frac{9b(9a^{2}-6ab+b^{2})}{2a(b^{2}-6ab+9a^{2})}= frac{2(a-3b)}{2a}+ frac{9b}{2a}= frac{2a-6b+9b}{2a}= frac{2a+3b}{2a}$