Помогите!!!!!!!!!!!!!!! срочно

1)
$\frac{8}{27} \times \frac{9}{7} \div \frac{4}{7} = \frac{8 \times 9 \times 7}{27 \times 7 \times 4} = \frac{2}{3}$
3)
$2 \frac{2}{3} \div \frac{24}{35} \div 2 \frac{7}{9} = \frac{8 \times 35 \times 9}{3 \times 24 \times 25} = \frac{7}{5} = 1.4$
5)
$\frac{15}{16} \div \frac{5}{8} \times 1 \frac{1}{9} = \frac{15 \times 8 \times 10}{16 \times 5 \times 9} = \frac{5}{3} = 1 \frac{2}{3}$
7)
$4 \frac{9}{38} \times \frac{5}{23} \div \frac{7}{19} = \frac{161 \times 5 \times 19}{38 \times 23 \times 7} = \frac{5}{2} = 2.5$