8 2/5-1 4/5-2 3/5=
[m]8\frac{2}{5}-1\frac{4}{5}-2\frac{3}{5}=(8+\frac{2}{5})-(1+\frac{4}{5})-(2+\frac{3}{5})=8+\frac{2}{5}-1-\frac{4}{5}-2-\frac{3}{5}=(8-1-2)+(\frac{2}{5}-\frac{4}{5}-\frac{3}{5})=5+(\frac{2}{5}-\frac{7}{5})=5+(-\frac{5}{5})=5-1=4[/m]
