Question

Найдите значение выражения! Срочно!

Answer 1

$\frac{(ab^{2} -a^{3})(b^{4}+a^{3}b)}{(a^{2}+2ab+b^{2})(b-a)(a^{2}-ab+b^{2})}=\frac{a(b^{2}-a^{2})b(b^{3}+a^{3} )}{(b+a)(b-a)(a+b)(a^{2}-ab+b^{2})} =\frac{ab(b^{2}-a^{2})(b^{3}+a^{3} )}{(b^{2}-a^{2})(a^{3}+b^{3})}=ab\\\\a*b=(-\frac{7}{6})*(\frac{18}{7})=-\frac{18}{6}=-3\\\\Otvet:\boxed{-3}$