सरल करें $\frac{{\displaystyle \frac{1}{3}}+{\displaystyle \frac{1}{4}}\left[{\displaystyle \frac{2}{5}}-{\displaystyle \frac{1}{2}}\right]}{{\displaystyle \frac{3}{4}} \mathrm{का} 1{\displaystyle \frac{2}{3}}-{\displaystyle \frac{4}{5}}\mathrm{का} {\displaystyle \frac{3}{4}}}$