Question

помогите решить это задачу

Answer 1

$frac{2m^2-n^2}{m^3+n^3} - frac{m-n}{m^2-mn+n^2} = frac{2m^2-n^2}{(m+n)(m^2-mn+n^2)} - frac{m-n}{m^2-mn+n^2} = \ \ = frac{2m^2-n^2-(m-n)(m+n)}{(m+n)(m^2-mn+n^2)} =frac{2m^2-n^2-(m^2-n^2)}{(m+n)(m^2-mn+n^2)}= \ \ frac{2m^2-n^2-m^2+n^2)}{m^3+n^3}= frac{m^2}{m^3+n^3}$