1) $$\frac{2}{11} + \frac{3}{11} = \frac{2+3}{11} = \frac{5}{11}$$
Ответ: $$\frac{5}{11}$$
2) $$\frac{7}{12} - \frac{2}{12} = \frac{7-2}{12} = \frac{5}{12}$$
Ответ: $$\frac{5}{12}$$
3) $$\frac{5}{46} + \frac{12}{46} = \frac{5+12}{46} = \frac{17}{46}$$
Ответ: $$\frac{17}{46}$$
4) $$\frac{25}{50} + \frac{4}{50} = \frac{25+4}{50} = \frac{29}{50}$$
Ответ: $$\frac{29}{50}$$
5) $$\frac{16}{35} + \frac{3}{35} = \frac{16+3}{35} = \frac{19}{35}$$
Ответ: $$\frac{19}{35}$$
6) $$\frac{8}{9} - \frac{6}{9} = \frac{8-6}{9} = \frac{2}{9}$$
Ответ: $$\frac{2}{9}$$