355. Выполните действия: a) $$11\frac{2}{7}+4\frac{3}{7}-6\frac{4}{7}$$; б) $$26\frac{7}{19}-13\frac{4}{19}+5\frac{2}{19}$$; в) $$44\frac{2}{9}+8\frac{5}{9}-7\frac{7}{9}$$; г) $$5\frac{7}{10}+3\frac{9}{10}+1\frac{3}{10}$$; д) $$3\frac{17}{100}-2\frac{13}{100}-1$$; е) $$8-4\frac{31}{100}-2\frac{57}{100}$$.

а) $$11\frac{2}{7}+4\frac{3}{7}-6\frac{4}{7} = (11+4-6) + (\frac{2}{7}+\frac{3}{7}-\frac{4}{7}) = 9 + \frac{1}{7} = 9\frac{1}{7}$$; б) $$26\frac{7}{19}-13\frac{4}{19}+5\frac{2}{19} = (26-13+5) + (\frac{7}{19}-\frac{4}{19}+\frac{2}{19}) = 18 + \frac{5}{19} = 18\frac{5}{19}$$; в) $$44\frac{2}{9}+8\frac{5}{9}-7\frac{7}{9} = (44+8-7) + (\frac{2}{9}+\frac{5}{9}-\frac{7}{9}) = 45 + 0 = 45$$; г) $$5\frac{7}{10}+3\frac{9}{10}+1\frac{3}{10} = (5+3+1) + (\frac{7}{10}+\frac{9}{10}+\frac{3}{10}) = 9 + \frac{19}{10} = 9 + 1\frac{9}{10} = 10\frac{9}{10}$$; д) $$3\frac{17}{100}-2\frac{13}{100}-1 = (3-2-1) + (\frac{17}{100}-\frac{13}{100}) = 0 + \frac{4}{100} = \frac{4}{100} = 0.04$$; е) $$8-4\frac{31}{100}-2\frac{57}{100} = (8-4-2) + (0 - \frac{31}{100}-\frac{57}{100}) = 2 - \frac{88}{100} = 2 - 0.88 = 1.12$$ или $$1\frac{12}{100} = 1\frac{3}{25}$$.