Автор - klimenkol21

нужна помощь!
4/ (m-n)² - 7/ n-m

Ответ

Автор - mayli
 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} }

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