a) $$\frac{10}{11} - \frac{4}{11} + \frac{3}{11} = \frac{10 - 4 + 3}{11} = \frac{9}{11}$$
Ответ: $$\frac{9}{11}$$
б) $$4 \frac{5}{9} + 3 \frac{8}{9} = (4 + 3) + (\frac{5}{9} + \frac{8}{9}) = 7 + \frac{13}{9} = 7 + 1 \frac{4}{9} = 8 \frac{4}{9}$$
Ответ: $$8 \frac{4}{9}$$
в) $$6 - 2 \frac{3}{8} = 5 \frac{8}{8} - 2 \frac{3}{8} = (5 - 2) + (\frac{8}{8} - \frac{3}{8}) = 3 \frac{5}{8}$$
Ответ: $$3 \frac{5}{8}$$
г) $$5 \frac{6}{13} - 1 \frac{11}{13} = 4 \frac{19}{13} - 1 \frac{11}{13} = (4 - 1) + (\frac{19}{13} - \frac{11}{13}) = 3 + \frac{8}{13} = 3 \frac{8}{13}$$
Ответ: $$3 \frac{8}{13}$$