次の計算をし，ア～クに当てはまる数を半角英数字で入力しなさい。ただし，\(\displaystyle -\frac{1}{2}\)のような分数は，\(\displaystyle \frac{-1}{2}\)のように分子に符号を含む形で入力すること。

1. \(\displaystyle \left( -\frac{1}{4} \right) +\frac{2}{13} \times \left( \frac{1}{7} +\frac{1}{6} \right) = \frac{\fbox{ア}}{\fbox{イ}} \)
2. \(\displaystyle (-5) \div \left( -\frac{1}{4} \right) +\left( -\frac{1}{3} \right) \div \left( -1\frac{1}{2} \right) = \frac{\fbox{ウ}}{\fbox{エ}} \)
3. \(\displaystyle \left( -\frac{3}{4} \right) \times \left( -1\frac{1}{3} \right) +\left( \frac{3}{5} \right)^2 -\frac{1}{2} = \frac{\fbox{オ}}{\fbox{カ}} \)
4. \(\displaystyle \left( -\frac{1}{2} \right)^3 \div 0.75 \times \left( -\frac{9}{5} \right) +\frac{1}{5} = \frac{\fbox{キ}}{\fbox{ク}} \)