[tex]2,5-(-1\frac{2}{3})=2\frac{1}{2}+1\frac{2}{3}=2\frac{3}{6}+1\frac{4}{6}=3\frac{7}{6}=4\frac{1}{6}\\\\-1\frac{5}{8}-1,6=-1\frac{5}{8}-1\frac{3}{5}=-1\frac{25}{40}-1\frac{24}{40}=-2\frac{49}{40}=-3\frac{9}{40}\\\\-1,2-(-2\frac{4}{5})=-1,2+2,8=2,8-1,2=1,6\\\\-2\frac{1}{4}-1,25=-2,25-1,25=-3,5[/tex]
