Вычислите 5/9:2/7 3/7:21 3:5 7/18:14/27 15:3/5 6:12

Решите задачу:

$\frac{5}{9} * \frac{7}{2} = \frac{5*7}{9*2}= \frac{35}{18}=1 \frac{17}{18}$

$\frac{3}{7}* \frac{1}{21}= \frac{3}{7*21}= \frac{3}{147}$

$\frac{3}{5} =\frac{3}{5}$

$\frac{7}{18} * \frac{27}{14} = \frac{9}{6*2}= \frac{3}{2*2} = \frac{3}{4}$

$15* \frac{5}{3}= \frac{5*5}{1}=25$

$\frac{6}{12}= \frac{3}{6}= \frac{1}{2}$