Question

нужна помощь!
4/ (m-n)² - 7/ n-m

Answer 1

$\frac{4}{(m-n) ^{2} } - \frac{7}{n-m} = \frac{4}{(m-n) ^{2} } + \frac{7}{m-n} = \frac{4}{(m-n) ^{2} } + \frac{7(m-n)}{(m-n) ^{2} } = \frac{4+7(m-n)}{(m-n) ^{2} } =$

$= \frac{4+7m-7n}{(m-n) ^{2} }$