Question

Сократите дробь (m-n)^2/n^2-m^2

Answer 1

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