Друзья помогите) 1-ый пример

Решите задачу:

$(3 \frac{1}{3}+5 \frac{1}{6} )* \frac{2}{5}-2 \frac{3}{4}:(1 \frac{1}{2} - \frac{2}{5} ) =(3 \frac{2}{6}+5 \frac{1}{6} )* \frac{2}{5}-2 \frac{3}{4}:(1 \frac{5}{10} - \frac{4}{10} ) = \\ \\ =8 \frac{3}{6}* \frac{2}{5}-2 \frac{3}{4}:1 \frac{1}{10} =8 \frac{1}{2}* \frac{2}{5}- \frac{11}{4}: \frac{11}{10} = \frac{17}{2}* \frac{2}{5}- \frac{11}{4}* \frac{10}{11} = \frac{17}{5}- \frac{10}{4} = \\ \\ = 3 \frac{2}{5}- \frac{5}{2} =3 \frac{2}{5}- 2\frac{1}{2} =3 \frac{4}{10}- 2\frac{5}{10} =9/10$