2 и 3 столбики СРОЧНО ПОМОГИТЕ

Решите задачу:

$1,6+ \frac{2}{5} =1 \frac{6}{10}+ \frac{2}{5}= \frac{16}{10} + \frac{2}{5} = \frac{8+2}{5}= \frac{10}{5}= \frac{2}{1} =2 \\ \\ 2 \frac{1}{4} +3,5= \frac{9}{4}+3 \frac{5}{10}= \frac{9}{4}+ \frac{35}{10}= \frac{9+14}{4}= \frac{23}{4}=5 \frac{3}{4} =5,75 \\ \\ 0,75+1 \frac{1}{6} = \frac{75}{100} + \frac{7}{6} = \frac{3}{4} + \frac{7}{6} = \frac{9+14}{12} = \frac{23}{12} =1 \frac{11}{12} \\ \\ 0,5- \frac{1}{3} = \frac{1}{2} - \frac{1}{3} = \frac{3-2}{6} = \frac{1}{6}$

$\frac{3}{4} -0,4= \frac{3}{4} -\frac{4}{10} = \frac{15-8}{20} = \frac{7}{20} =0,35 \\ \\ 1,9-1 \frac{1}{2} =1\frac{9}{10} -1\frac{1}{2} =\frac{19}{10} - \frac{3}{2} = \frac{19-15}{10} = \frac{4}{10} = \frac{2}{5} =0,4$