a) \[ \frac{\frac{1}{2} + \frac{1}{3}}{\frac{1}{4} - \frac{1}{6}} = \]
b) \[ \frac{\frac{3}{4} - \frac{1}{2}}{\frac{2}{3} + \frac{1}{6}} = \]
c) \[ \frac{\frac{5}{6} + \frac{1}{2}}{\frac{3}{4} - \frac{1}{3}} = \]
d) \[ \frac{\frac{7}{8} - \frac{1}{4}}{\frac{1}{3} + \frac{1}{9}} = \]
e) \[ \frac{\frac{2}{5} + \frac{3}{10}}{\frac{3}{4} - \frac{1}{2}} = \]
f) \[ \frac{\frac{1}{3} + \frac{1}{4}}{\frac{2}{5} - \frac{1}{10}} = \]
