а)

\frac{5}{24} + \frac{3}{8}

;
б)

\frac{7}{10} - \frac{2}{5}

;
в)

\frac{3}{4} - \frac{2}{5}

;
г)

\frac{8}{11} + \frac{1}{2}

а) 5 24 + 3 8 ; б) 7 10 − 2 5 ; в) 3 4 − 2 5 ; г) 8 11 + 1 2 .

\frac{5}{24} + \frac{3}{8} = \frac{5 + 3 * 3}{24} = \frac{5 + 9}{24} = \frac{14}{24} = \frac{7}{12}

\frac{7}{10} - \frac{2}{5} = \frac{7 - 2 * 2}{10} = \frac{7 - 4}{10} = \frac{3}{10}

\frac{3}{4} - \frac{2}{5} = \frac{3 * 5 - 2 * 4}{20} = \frac{15 - 8}{20} = \frac{7}{20}

\frac{8}{11} + \frac{1}{2} = \frac{8 * 2 + 1 * 11}{22} = \frac{16 + 11}{22} = \frac{27}{22} = 1 \frac{5}{22}