Question

помогите срочно пж прошу

Answer 1

$frac{(a - 5)^2}{a^2 + 5a} : left( frac{5}{a + 5} - frac{a^2 + 25}{a^2 - 25} - frac{5}{5 - a} right) = frac{(a - 5)^2}{a(a + 5)} : left( frac{5}{a + 5} - frac{a^2 + 25}{(a - 5)(a + 5)} + frac{5}{a - 5} right) = frac{(a - 5)^2}{a(a + 5)} : left( frac{5a - 25 - a^2 - 25 + 5a + 25}{(a - 5)(a + 5)} right) = frac{(a - 5)^2}{a(a + 5)} : left(-frac{a^2 - 10a + 25}{(a - 5)(a + 5)} right) = - frac{(a - 5)^2 (a - 5)(a + 5)}{a(a + 5)(a - 5)^2} = -frac{a - 5}{a}$