۱) $1 - \frac{1 - \frac{3}{2} \times \frac{2}{5}}{\frac{7}{5} - \frac{3}{5} \times \frac{5}{7}} \div \frac{1}{4} = $

۲) $\frac{\frac{2}{3} - \frac{1}{2}}{\frac{2}{3} + \frac{1}{2}} = $

۳) $[(-5/2) + (-5/6)] \div [(-5/2) + 2] = $

۴) $\frac{2}{3} - \frac{1}{2} + \frac{1}{5} - \frac{3}{2} = $