Question

Решите задание со скрина, пожалуйста:3

Answer 1

$...= frac{k}{(k+5)(k+5)} - frac{k}{(k-5)(k+5)} = frac{k(k-5)-k(k+5)}{(k-5)(k+5)^2} = frac{k^2-5k-k^2-5k}{(k-5)(k+5)^2}= \ = frac{-10k}{(k+5)(k+5)(k-5)} .$