1,5-(\frac{1}{3}+0,2+0,05+\frac{1}{4})=1,5-(\frac{4}{12}+0,25+\frac{3}{12})=1,5-(\frac{7}{12}+\frac{25}{100})=1,5-(\frac{7}{12}+\frac{1}{4})=1,5-(\frac{7}{12}+\frac{3}{12})=1,5-\frac{10}{12}=1,5-\frac{5}{6}=1\frac{5}{10}-\frac{5}{6}=1\frac{15}{30}-\frac{25}{30}=1\frac{45}{30}-\frac{25}{30}=\frac{20}{30}=\frac{2}{3}