Вычислите 542 номер 10баллов

1)
$5 + \frac{5}{16} - \frac{3}{24} = 5 + \frac{5}{16} - \frac{1}{8} = 5 + \frac{5}{16} - \frac{2}{16} = \\ \\ = 5 + \frac{5-2}{16} =5 \frac{3}{16}$
2)
$1 \frac{1}{2} + 4 \frac{1}{4} + 3 \frac{1}{8} =1 \frac{4}{8} + 4 \frac{2}{8} + 3 \frac{1}{8} =8 \frac{4+2+1}{8} =8 \frac{7}{8}$
3)
$6 \frac{5}{9} +2 \frac{7}{18} -7 \frac{11}{36} =6 \frac{20}{36} +2 \frac{14}{36} -7 \frac{11}{36} =1 \frac{20+14-11}{36} =1 \frac{23}{36}$
4)
$21 \frac{13}{15} -11 \frac{7}{12} + 18 \frac{11}{20} =21 \frac{52}{60} -11 \frac{35}{60} + 18 \frac{33}{60} = \\ \\ =28 \frac{52-35+33}{60} =28 \frac{50}{60} =28 \frac{5}{6}$