Tính

a) \(\frac{4}{5} + \frac{6}{5} = \frac{{4 + 6}}{5} = \frac{{10}}{5} = 2\)

b) \(\frac{7}{{11}} - \frac{2}{{11}} = \frac{{7 - 2}}{{11}} = \frac{5}{{11}}\)

c) \(2 + \frac{3}{7} = \frac{2}{1} + \frac{3}{7} = \frac{{14}}{7} + \frac{3}{7} = \frac{{14 + 3}}{7} = \frac{{17}}{7}\)

d) \(3 - \frac{3}{{10}} = \frac{3}{1} - \frac{3}{{10}} = \frac{{30}}{{10}} - \frac{3}{{10}} = \frac{{30 - 3}}{{10}} = \frac{{27}}{{10}}\)