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Автор - abdullaabdiev

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Ответ

Автор - CVita
 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}

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