Question

Помогите надо УПРОСТИТЬ ПРИМЕР!!!

Answer 1

$......=frac{a+4}{(a-3)(a-3)} *frac{2(a-3)}{(a-4)(a+4)}- frac{2}{a-4} =frac{2}{(a-3)(a-4)} -frac{2}{a-4} =\ \ frac{2-2(a-3)}{(a-3)(a-4)} =frac{2-2a+6}{(a-3)(a-4)} =frac{8-2a}{(a-3)(a-4)} =frac{2(4-a)}{(a-3)(a-4)} =frac{-2(a-4)}{(a-3)(a-4)} =-frac{2}{a-3}$