а) (x(x+1)-x)/(x+1) = (x^2+x-x)/(x+1) = x^2/(x+1)
б) (m+2)/(4m) - 1/(m+4) = (m^2+2m-4m)/(4m(m+4)) = (m^2-2m)/(4m(m+4))
а) (x(x+1)-x)/(x+1) = (x^2+x-x)/(x+1) = x^2/(x+1)
б) (m+2)/(4m) - 1/(m+4) = (m^2+2m-4m)/(4m(m+4)) = (m^2-2m)/(4m(m+4))