1. Вычислите: а) 6 + 2 1/3 = 6 + 2 + 1/3 = ... + 1/3 = ________

1. Вычислите: а) $6 + 2\frac{1}{3} = 6 + 2 + \frac{1}{3} = 8 + \frac{1}{3} = 8\frac{1}{3}$ б) $28\frac{2}{5} - 12 = 28 + \frac{2}{5} - 12 = 28 - 12 + \frac{2}{5} = 16 + \frac{2}{5} = 16\frac{2}{5}$ в) $9 - \frac{4}{13} = 8 + 1 - \frac{4}{13} = 8 + (\frac{13}{13} - \frac{4}{13}) = 8 + \frac{9}{13} = 8\frac{9}{13}$ или $9 - \frac{4}{13} = 8\frac{13}{13} - \frac{4}{13} = 8\frac{9}{13}$ г) $15 - \frac{6}{11} = 14 + 1 - \frac{6}{11} = 14 + \frac{5}{11} = 14\frac{5}{11}$ или $15 - \frac{6}{11} = 14\frac{11}{11} - \frac{6}{11} = 14\frac{5}{11}$ 2. Найдите сумму смешанных чисел: а) $2\frac{3}{7} + 4\frac{1}{7} = (2+4) + (\frac{3}{7} + \frac{1}{7}) = 6 + \frac{4}{7} = 6\frac{4}{7}$ б) $5\frac{1}{6} + 3\frac{5}{6} = (5+3) + (\frac{1}{6} + \frac{5}{6}) = 8 + \frac{6}{6} = 8+1 = 9$ в) $1\frac{2}{5} + 2\frac{4}{5} = (1+2) + (\frac{2}{5} + \frac{4}{5}) = 3 + \frac{6}{5} = 3 + 1\frac{1}{5} = 4\frac{1}{5}$ г) $6\frac{7}{11} + 1\frac{5}{11} = (6+1) + (\frac{7}{11} + \frac{5}{11}) = 7 + \frac{12}{11} = 7 + 1\frac{1}{11} = 8\frac{1}{11}$