Помогите с дробями пожалуйста !)) 10 : 2/5 - 3/10 = (1,1/2 - 3/8) : 3 = 3/4 : (1 - 1/4 +...

Решите задачу:

$10: \frac{2}{5}- \frac{3}{10}=10* \frac{5}{2}- \frac{3}{10}=5* \frac{5}{1} - \frac{3}{10}=25-0.3=24.7; \\ (1 \frac{1}{2}- \frac{3}{8}):3=(1 \frac{4}{8}- \frac{3}{8}):3=1 \frac{1}{8}:3= \frac{9}{8}* \frac{1}{3} = \frac{3}{8} ; \\ \frac{3}{4}:(1- \frac{1}{4}+ \frac{3}{8} )= \frac{3}{4}:( \frac{8}{8} - \frac{2}{8}+ \frac{3}{8} )= \frac{3}{4}: \frac{7}{8} = \frac{3}{4}* \frac{8}{7} = \frac{6}{7}; \\$

$( \frac{1}{3}+ \frac{1}{4}):(2- \frac{5}{6} )=( \frac{4}{12}+ \frac{3}{12}):(1 \frac{6}{6}- \frac{5}{6})= \frac{7}{12} :1 \frac{1}{6} = \\ = \frac{7}{12}: \frac{7}{6}= \frac{7}{12}* \frac{6}{7} = \frac{1}{2}.$