Помогите пожалуйста N 635 б)

1) 1 $\frac{1}{2}- \frac{2}{5} = \frac{3}{2} - \frac{2}{5} = \frac{15}{10} - \frac{4}{10}= \frac{11}{10}$
2) $\frac{3}{4} + \frac{5}{6}= \frac{9}{12}+ \frac{10}{12}= \frac{19}{12}$
3)2 $\frac{3}{4} : \frac{11}{10}= \frac{11}{4}$ · $\frac{10}{11} = \frac{5}{2} =2 \frac{5}{10}$
4) $\frac{19}{12}:3 \frac{1}{6} = \frac{19}{12} : \frac{19}{6} = \frac{19}{12}$ · $\frac{6}{19}= \frac{1}{2}$
5)2 $\frac{5}{10} + \frac{1}{2} =2 \frac{5}{10}+ \frac{5}{10} =2 \frac{10}{10}=3$