(7-3целых 7/11)-(4-2целых 3/11)
(7-3[m]\frac{7}{11}[/m])-(4-2[m]\frac{3}{11}[/m])=[m]7-3\frac{7}{11}-4+2\frac{3}{11}=3-1\frac{4}{11}=1\frac{7}{11}[/m]