Verified answer

а)

[tex]1\frac{3}{4} -1\frac{3}{8} +\frac{1}{8} =\frac{7}{4} -\frac{11}{8} +\frac{1}{8} =\frac{14}{8} -\frac{11}{8} +\frac{1}{8} =\frac{4}{8} =\frac{1}{2}[/tex]

б)

[tex]\frac{2}{3} +0,8-2\frac{1}{2} +\frac{3}{5} =\frac{2}{3} +\frac{8}{10} -\frac{5}{2} +\frac{3}{5}=\frac{20}{30} +\frac{24}{30} -\frac{75}{30} +\frac{18}{30} =-\frac{13}{30}[/tex]