$1\frac{1}{5}\cdot 2,5-3,5:1,4=\frac{6}{5}\cdot 2\frac{1}{2}-3\frac{1}{2}:\frac{14}{10}=\frac{6}{5}\cdot \frac{5}{2}-\frac{7}{2}\cdot \frac{10}{14}=\frac{3}{1}\cdot \frac{1}{1}-\frac{1}{1}\cdot \frac{5}{2}=3-2\frac{1}{2}=\frac{1}{2}=0,5$