Автор - artixabib

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Ответ

Автор - помогайка555

1/(m+5) - 4/(m+5)^2 : 4/(m^2-25) - (2m+21)/(m+5)= 1/(m+5) - 4/(m+5)^2 : 4/((m-5)(m+5)) - (2m+21)/(m+5)= 1/(m+5) - (4 (m-5)(m+5))/(4 (m+5)^2) - (2m+21)/(m+5)= 1/(m+5) - (m-5)/(m+5) - (2m+21)/(m+5)= (1 - (m-5) - (2m+21))/(m+5)= (1 - m + 5 - 2m - 21)/ (m+5)= (-15-3m)/(m+5)= (-3 (5+m))/(m+5)= -3

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