\(g,\dfrac{-3}{31}+\dfrac{-6}{17}+\dfrac{1}{25}+\dfrac{-28}{31}+\dfrac{-11}{17}+\dfrac{-1}{5}\\ =\left(\dfrac{-3}{31}+\dfrac{-28}{31}\right)+\left(\dfrac{-6}{17}+\dfrac{-11}{17}\right)+\left(\dfrac{1}{25}+\dfrac{-5}{25}\right)\\ =\dfrac{-31}{31}+\dfrac{-17}{17}+\dfrac{-1}{25}\\ =\left(-1\right)+\left(-1\right)+\dfrac{-4}{25}\\ =-\dfrac{54}{25}\\ h,\dfrac{-4}{12}+\dfrac{18}{45}+\dfrac{-6}{9}+\dfrac{-21}{35}+\dfrac{6}{30}\\ =\dfrac{-1}{2}+\dfrac{2}{5}+\dfrac{-2}{3}+\dfrac{-3}{5}+\dfrac{1}{5}\\ =\dfrac{-1}{2}+\dfrac{-2}{3}+\left(\dfrac{2}{5}+\dfrac{-3}{5}+\dfrac{1}{5}\right)\\ =\dfrac{-3}{6}+\dfrac{-4}{6}+\dfrac{0}{5}\\ =\dfrac{-7}{6}+0\\ =-\dfrac{7}{6}\)
g.\(g,\left[\dfrac{-3}{31}+\left(\dfrac{-28}{31}\right)\right]+\left[\dfrac{-6}{17}+\left(\dfrac{-11}{17}\right)\right]+\left[\dfrac{1}{25}+\left(\dfrac{-1}{5}\right)\right]=-1+(-1)+\left(\dfrac{-4}{25}\right)=\dfrac{-54}{25}h,\dfrac{-1}{3}+\dfrac{2}{5}+\dfrac{-2}{3}+\dfrac{-3}{5}+\dfrac{1}{5}=\left(\dfrac{-1}{3}+\dfrac{-2}{3}\right)+\left(\dfrac{2}{5}+\dfrac{-3}{5}+\dfrac{1}{5}\right)=-1+0=-1\)
