В)5/9:4 1/6 г)5/6:3 1/3 д)2 1/2:1 2/3е)3 1/2 :1 3/4ж)2 2/5 :1 1/5 з) 5 2/5:1 1/9

В)
$\frac{5}{9} \div \frac{25}{6}$

$\frac{5}{9} \times \frac{6}{25}$
$\frac{1}{3} \times \frac{2}{5}$
$\frac{2}{15}$
г)
$\frac{5}{6} \div \frac{10}{3}$
$\frac{5}{6} \times \frac{3}{10}$
$\frac{1}{2} \times \frac{1}{2}$
$\frac{1}{4}$
д)
$\frac{5}{2} \div \frac{5}{3}$
$\frac{5}{2} \times \frac{3}{5}$
$\frac{3}{2}$
$1.5$

е)
$\frac{7}{2} \div \frac{7}{4}$
$\frac{7}{2} \times \frac{4}{7}$
$2$

ж)
$\frac{12}{5} \div \frac{6}{5}$
$\frac{12}{5} \times \frac{5}{6}$
$2$
з)
$\frac{27}{5} \div \frac{10}{9}$
$\frac{27}{5} \times \frac{9}{10} = \frac{243}{50} = 4.86$