В 2.209 сделай буквы б,г а в 2.210 только б

2.209. б) $3 - (\frac{11}{14} - \frac{13}{21}) = 3 - (\frac{33}{42} - \frac{26}{42}) = 3 - \frac{7}{42} = 3 - \frac{1}{6} = \frac{18}{6} - \frac{1}{6} = \frac{17}{6} = 2\frac{5}{6}$ г) $6 \frac{3}{16} - 2 \frac{5}{24} - 3 \frac{11}{12} = 6 \frac{9}{48} - 2 \frac{10}{48} - 3 \frac{44}{48} = (6 - 2 - 3) + (\frac{9}{48} - \frac{10}{48} - \frac{44}{48}) = 1 - \frac{45}{48} = 1 - \frac{15}{16} = \frac{16}{16} - \frac{15}{16} = \frac{1}{16}$ 2.210. б) $(15 - 12\frac{5}{8}) - (13 \frac{1}{2} - 11 \frac{2}{9}) = (15 - \frac{101}{8}) - (\frac{27}{2} - \frac{101}{9}) = (\frac{120}{8} - \frac{101}{8}) - (\frac{243}{18} - \frac{202}{18}) = \frac{19}{8} - \frac{41}{18} = \frac{171}{72} - \frac{164}{72} = \frac{7}{72}$ **Ответ: 2.209 б) $2\frac{5}{6}$, г) $\frac{1}{16}$; 2.210 б) $\frac{7}{72}$**