Question

Сократить помогите!!!!

Answer 1

$\frac{4m}{m^2-n^2}- \frac{4}{m+n}= \frac{4m-4(m-n)}{m^2-n^2}= \frac{4m-4m+4n}{m^2-n^2}= \frac{4n}{m^2-n^2}$