0,6:[(2,5- 1 2/3)*6]=
0,6:[(2,5-1\frac{2}{3})*6]=
=0,6:[(2\frac{1}{2}-1\frac{2}{3})*6]=
=0,6:[(2\frac{3}{6}-1\frac{4}{6})*6]=
=0,6:[(\frac{15}{6}-\frac{10}{6})*6]=
=0,6:[\frac{5}{6}*\frac{6}{1}]=
=0,6:5=\frac{6}{10}*\frac{1}{5}=
=\frac{3}{5}*\frac{1}{5}=\frac{3}{25}