а) $$4\frac{5}{6}+2\frac{3}{8} = 4\frac{20}{24} + 2\frac{9}{24} = 6\frac{29}{24} = 7\frac{5}{24}$$
б) $$7\frac{5}{18}-1\frac{7}{12} = 7\frac{10}{36} - 1\frac{21}{36} = 6\frac{46}{36} - 1\frac{21}{36} = 5\frac{25}{36}$$
в) $$3\frac{4}{9}+2\frac{2}{7} = 3\frac{28}{63} + 2\frac{18}{63} = 5\frac{46}{63}$$
г) $$5\frac{3}{14}-1\frac{1}{21} = 5\frac{9}{42} - 1\frac{2}{42} = 4\frac{7}{42} = 4\frac{1}{6}$$