Question

Помогите пожалуйста.

Answer 1

$7)\frac{9a(a+1)}{5(a+1)}=\frac{9a}{5}\\\\Otvet:\boxed{\frac{9a}{5}}\\\\8)\frac{6x+3y}{4x^{2}+4xy+y^{2}}=\frac{3(2x+y)}{(2x+y)^{2}}=\frac{3}{2x+y}\\\\Otvet:\boxed{\frac{3}{2x+y}}$

$9)\frac{a-b}{b-a}=-\frac{a-b}{a-b}=-1\\\\Otvet:\boxed{-1}\\\\10)\frac{m^{3}-n^{3}}{m^{2}-n^{2}}=\frac{(m-n)(m^{2}+mn+n^{2})}{(m-n)(m+n)}=\frac{m^{2}+mn+n^{2}}{m+n}\\\\Otvet:\boxed{\frac{m^{2}+mn+n^{2}}{m+n}}$