2. Вычислите: a) (\frac{33}{19}+\frac{9}{19})+\frac{14}{19}; б) (\frac{5}{41}+\frac{16}{41})+\frac{13}{41}; в) \frac{40}{25}+(\frac{27}{25}+\frac{13}{25}); г) \frac{6}{12}+(\frac{24}{12}+\frac{47}{60}); e) \frac{18}{60}+(\frac{19}{28}+\frac{2}{28}); ж) (\frac{7}{14}+\frac{11}{14})+\frac{8}{14}; з) \frac{9}{17}+(\frac{13}{17}+\frac{9}{17})

a) (\frac{33}{19}+\frac{9}{19})+\frac{14}{19}=\frac{33+9}{19}+\frac{14}{19}=\frac{42}{19}+\frac{14}{19}=\frac{42+14}{19}=\frac{56}{19}

б) (\frac{5}{41}+\frac{16}{41})+\frac{13}{41}=\frac{5+16}{41}+\frac{13}{41}=\frac{21}{41}+\frac{13}{41}=\frac{21+13}{41}=\frac{34}{41}

в) \frac{40}{25}+(\frac{27}{25}+\frac{13}{25})=\frac{40}{25}+\frac{27+13}{25}=\frac{40}{25}+\frac{40}{25}=\frac{40+40}{25}=\frac{80}{25}=\frac{16}{5}

г) \frac{6}{12}+(\frac{24}{12}+\frac{47}{60})=\frac{6}{12}+(\frac{24 \cdot 5}{12 \cdot 5}+\frac{47}{60})=\frac{6}{12}+(\frac{120}{60}+\frac{47}{60})=\frac{6}{12}+\frac{167}{60}=\frac{6 \cdot 5}{12 \cdot 5}+\frac{167}{60}=\frac{30}{60}+\frac{167}{60}=\frac{30+167}{60}=\frac{197}{60}

e) \frac{18}{60}+(\frac{19}{28}+\frac{2}{28})=\frac{18}{60}+\frac{19+2}{28}=\frac{18}{60}+\frac{21}{28}=\frac{18}{60}+\frac{3}{4}=\frac{18}{60}+\frac{3 \cdot 15}{4 \cdot 15}=\frac{18}{60}+\frac{45}{60}=\frac{18+45}{60}=\frac{63}{60}=\frac{21}{20}

ж) (\frac{7}{14}+\frac{11}{14})+\frac{8}{14}=\frac{7+11}{14}+\frac{8}{14}=\frac{18}{14}+\frac{8}{14}=\frac{18+8}{14}=\frac{26}{14}=\frac{13}{7}

з) \frac{9}{17}+(\frac{13}{17}+\frac{9}{17})=\frac{9}{17}+\frac{13+9}{17}=\frac{9}{17}+\frac{22}{17}=\frac{9+22}{17}=\frac{31}{17}

Ответ: a) \frac{56}{19}; б) \frac{34}{41}; в) \frac{16}{5}; г) \frac{197}{60}; e) \frac{21}{20}; ж) \frac{13}{7}; з) \frac{31}{17}