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3m/(m+1) - (m-1)/m = (3m*m - [(m-1)(m+1)] )/(m+1)m = (2m^2 +1)/(m+1)m
Sprowadzasz do wspólnego mianownika:
[3m*m - (m-1)*(m+1)]/[(m+1)*m]
wymnażasz:
[3m^2-m^2+1]/(m^2+m)=
(2m^2+1)/m^2+m