Найдите значение выражения

16)
$\frac{5}{40} - 3.6 \times \frac{5}{9} = \frac{1}{8} - \frac{36}{10} \times \frac{5}{9} = \frac{1}{8} - \frac{4 \times 1}{2 \times 1} = \frac{1}{8} - 2 = \frac{1}{8} - \frac{16}{8} = - \frac{15}{8}$
17)
$\frac{27}{10} - 1.8 \times \frac{2}{9} = \frac{27}{10} - \frac{18}{10} \times \frac{2}{9} = \frac{27}{10} - \frac{2 \times 1}{5 \times 1} = \frac{27}{10} - \frac{2}{5} = \frac{27}{10} - \frac{4}{10} = \frac{23}{10} = 2.3$
18)
$3 \frac{8}{15} - 0.2 \times 2 \frac{2}{3} = \frac{53}{15} - \frac{2}{10} \times \frac{8}{3} = \frac{53}{15} - \frac{1 \times 8}{5 \times3 } = \frac{53}{15} - \frac{8}{15} = \frac{45}{15} = 3$
19)
$4 \frac{6}{25} - 0.3 \times 1 \frac{3}{5} = \frac{106}{25} - \frac{3}{10} \times \frac{8}{5} = \frac{106}{25} - \frac{3 \times 4}{5 \times 5} = \frac{106}{25} - \frac{12}{25} = \frac{94}{25} = 3 \frac{19}{25}$