сократитеповторяю вопрос так как на 1 никто не ответил, 35 баллов / 2. Created by silantyevnikitp3u6qm. algebra-ru

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leramatvienko1994

$ab+\dfrac{ab}{a+b}\cdot \Big(\dfrac{a+b}{a-b}-a-b\Big)=ab+\dfrac{ab}{a+b}\cdot \Big(\dfrac{a+b}{a-b}-(a+b)\Big)=\\\\\\=ab+\dfrac{ab}{a+b}\cdot \dfrac{a+b}{a-b}-\dfrac{ab}{a+b}\cdot (a+b)=ab+\dfrac{ab}{a-b}-ab=\dfrac{ab}{a-b}$

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