Question

номер 7 плиз очень надо

Answer 1

$frac{8ab}{a+8b} * (frac{a}{8b} - frac{8b}{a} ) = frac{8ab}{a+8b} * ( frac{ a^{2}-64 b^{2} }{8ab} ) = frac{8ab}{a+8b} * (frac{(a-8b)*(a+8b)}{8ab} ) = a-8b$