Номер 647 пожалуйста помогите срочно!!!

1)
$= 3 \frac{3}{4} (1 \frac{2}{3} + \frac{1}{3} ) = 3 \frac{3}{4} \times 1 \frac{3}{3} = \\ \frac{15}{4} \times 2 = \frac{15 \times 2}{4} = \frac{15}{2} = 7 \frac{1}{2}$
2)
$= 1 \frac{2}{5} (2 \frac{5}{7} - \frac{3}{14} ) = 1 \frac{2}{5} (2 \frac{10}{14} - \frac{3}{14} ) = \\ 1 \frac{2}{5} \times 2 \frac{7}{14} = \frac{7}{5} \times \frac{5}{2} = \frac{7}{2} = 3 \frac{1}{2}$
3)
$= \frac{1}{9} (1 \frac{5}{6} + 1 \frac{1}{6} ) = \frac{1}{9} \times 2 \frac{6}{6} = \\ \frac{1}{9} \times 3 = \frac{3}{9} = \frac{1}{3}$
4)
$= \frac{3}{5} (1 \frac{3}{8} - \frac{1}{8} ) = \frac{3}{5} \times 1 \frac{2}{8} = \frac{3}{5} \times \frac{5}{4} = \frac{3}{4}$