8/9 + 3/7 =

Решение примеров: 1) $\frac{8}{9} + \frac{3}{7} = \frac{56}{63} + \frac{27}{63} = \frac{83}{63} = 1\frac{20}{63}$ 2) $\frac{7}{10} + \frac{3}{4} = \frac{14}{20} + \frac{15}{20} = \frac{29}{20} = 1\frac{9}{20}$ 3) $\frac{11}{15} + \frac{3}{5} = \frac{11}{15} + \frac{9}{15} = \frac{20}{15} = \frac{4}{3} = 1\frac{1}{3}$ 4) $\frac{6}{7} + \frac{2}{5} = \frac{30}{35} + \frac{14}{35} = \frac{44}{35} = 1\frac{9}{35}$ 5) $\frac{2}{7} + \frac{4}{7} = \frac{6}{7}$ 6) $\frac{16}{21} - \frac{2}{7} = \frac{16}{21} - \frac{6}{21} = \frac{10}{21}$ 7) $\frac{5}{9} - \frac{1}{3} = \frac{5}{9} - \frac{3}{9} = \frac{2}{9}$ 8) $1\frac{1}{4} - \frac{3}{5} = \frac{5}{4} - \frac{3}{5} = \frac{25}{20} - \frac{12}{20} = \frac{13}{20}$