Выполните действия:
1) $2\frac{6}{19} + 3\frac{11}{19}$;
2) $8\frac{19}{24} - 5\frac{13}{24}$;
3) $4 - 1\frac{3}{8}$;
4) $6\frac{3}{11} - 2\frac{7}{11}$.
$2\frac{6}{19} + 3\frac{11}{19} = (2 + 3) + (\frac{6}{19} + \frac{11}{19}) = 5 + \frac{17}{19} = 5\frac{17}{19}$
$8\frac{19}{24} - 5\frac{13}{24} = (8 - 5) + (\frac{19}{24} - \frac{13}{24}) = 3 + \frac{6}{24} = 3 + \frac{1}{4} = 3\frac{1}{4}$
$4 - 1\frac{3}{8} = 3\frac{8}{8} - 1\frac{3}{8} = (3 - 1) + (\frac{8}{8} - \frac{3}{8}) = 2 + \frac{5}{8} = 2\frac{5}{8}$
$6\frac{3}{11} - 2\frac{7}{11} = 5\frac{14}{11} - 2\frac{7}{11} = (5 - 2) + (\frac{14}{11} - \frac{7}{11}) = 3 + \frac{7}{11} = 3\frac{7}{11}$
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