3. Выполни действия устно наиболее простым способом: a) $$3\frac{19}{24} + (5\frac{1}{9} + 1\frac{5}{24}) = ?$$ б) $$(1\frac{5}{8} + 4\frac{8}{17}) + (\frac{9}{17} + 2\frac{3}{8}) = ?$$ в) $$7\frac{16}{35} - (3\frac{11}{35} + 4\frac{1}{35}) = ?$$ г) $$(4\frac{56}{789} + 1\frac{5}{6}) - 4\frac{56}{789} = ?$$ д) $$(1\frac{6}{11} + 5\frac{16}{39}) - 2\frac{16}{39} = ?$$ е) $$7\frac{13}{14} - (2\frac{13}{14} + 4\frac{17}{25}) = ?$$

a) $$3\frac{19}{24} + (5\frac{1}{9} + 1\frac{5}{24}) = 3\frac{19}{24} + 1\frac{5}{24} + 5\frac{1}{9} = (3+1) + (\frac{19}{24} + \frac{5}{24}) + 5\frac{1}{9} = 4 + \frac{24}{24} + 5\frac{1}{9} = 5 + 5\frac{1}{9} = 10\frac{1}{9}$$ б) $$(1\frac{5}{8} + 4\frac{8}{17}) + (\frac{9}{17} + 2\frac{3}{8}) = 1\frac{5}{8} + 2\frac{3}{8} + 4\frac{8}{17} + \frac{9}{17} = (1+2) + (\frac{5}{8} + \frac{3}{8}) + 4 + (\frac{8}{17} + \frac{9}{17}) = 3 + \frac{8}{8} + 4 + \frac{17}{17} = 3 + 1 + 4 + 1 = 9$$ в) $$7\frac{16}{35} - (3\frac{11}{35} + 4\frac{1}{35}) = 7\frac{16}{35} - 3\frac{11}{35} - 4\frac{1}{35} = (7-3-4) + (\frac{16}{35} - \frac{11}{35} - \frac{1}{35}) = 0 + \frac{16-11-1}{35} = \frac{4}{35}$$ г) $$(4\frac{56}{789} + 1\frac{5}{6}) - 4\frac{56}{789} = 4\frac{56}{789} - 4\frac{56}{789} + 1\frac{5}{6} = 1\frac{5}{6}$$ д) $$(1\frac{6}{11} + 5\frac{16}{39}) - 2\frac{16}{39} = 1\frac{6}{11} + 5\frac{16}{39} - 2\frac{16}{39} = 1\frac{6}{11} + (5-2) + (\frac{16}{39} - \frac{16}{39}) = 1\frac{6}{11} + 3 + 0 = 4\frac{6}{11}$$ е) $$7\frac{13}{14} - (2\frac{13}{14} + 4\frac{17}{25}) = 7\frac{13}{14} - 2\frac{13}{14} - 4\frac{17}{25} = (7-2) + (\frac{13}{14} - \frac{13}{14}) - 4\frac{17}{25} = 5 - 4\frac{17}{25} = 1 - \frac{17}{25} = \frac{25}{25} - \frac{17}{25} = \frac{8}{25}$$