Найдите значение выражений

16. Задача 2304.

$3 \frac{4}{5} + 3 + ( - \frac{11}{10} ) = 6 \frac{4}{5} - \frac{11}{10} = 6 \frac{8}{10} - \frac{11}{10} = 6 - \frac{3}{10} = 5 \frac{10 - 3}{10} = 5 \frac{7}{10} = 5.7$

17. Задача 2305.

$2 \frac{1}{12} + 1.2 + 3 \frac{1}{6} = 5 \frac{1 + 2}{12} + 1.2 = 5 \frac{3}{12} + 1.2 = 5 \frac{1}{4} + 1.2 = 5.25 + 1.2 = 6.45$

18. Задача 2289.

$4 \frac{1}{7} + 12 + 3 \frac{5}{14} = 19 \frac{2 + 5}{14} = 19 \frac{7}{14} = 19 \frac{1}{2} = 19.5$

19. Задача 2290.

$3 \frac{2}{9} + ( - 11) + 4 \frac{7}{9} = 7 \frac{9}{9} - 11 = 8 - 11 = - 3$