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1}
$\frac{4}{27} \times \frac{9}{16} = \frac{1}{12}$
$5 \frac{3}{5} \times 1 \frac{4}{21} = \frac{28}{5} \times \frac{25}{21} = \frac{140}{21} = \\ = 6 \frac{14}{21 } = 6 \frac{2}{3}$
$\frac{13}{16} \times 32 = 26$
2)
$56 \times \frac{4}{7} = 32$
Ответ: Вика купила 32 тетради
3)
$(3 - \frac{15}{28} \times 1 \frac{1}{6} ) \times 2 \frac{2}{19} = 5$
$\frac{15}{28} \times 1 \frac{1}{6} = \frac{15}{28} \times \frac{7}{6} = \frac{5}{8} \\ 3 - \frac{5}{8} = 2 \frac{8}{8} - \frac{5}{8} = 2 \frac{3}{8}$
$2 \frac{3}{8} \times 2 \frac{2}{19} = \frac{19}{8} \times \frac{40}{19} = 5$
5)
$2 \frac{10}{13 } \times (1 \frac{1}{2} + 2 \frac{3}{4} - 3 \frac{1}{6} ) = 3$
$1 \frac{1}{2} + 2 \frac{3}{4} = 1 \frac{2}{4} + 2 \frac{3}{4} = 3 \frac{5}{4} = 4 \frac{1}{4}$
$4 \frac{1}{4} - 3 \frac{1}{6} = 4 \frac{6}{24} - 3 \frac{4}{24} = 1 \frac{2}{24} = 1 \frac{1}{12}$
$2 \frac{10}{13} \times 1 \frac{1}{12} = \frac{36}{13} \times \frac{13}{12} = 3$