| 7,5 |+|- 5,3| 2) |12,8|-|-5 целых 1/4|

[tex] |7.5| + | - 5.3| \\ 7.5 + 5.3 = 12.8 \\ \\ 2) |12.8| - | - 5 \frac{1}{4} | \\ \\ 12.8 - | - \frac{5}{4} | \\ \\ \frac{64}{5} - \frac{5}{4} \\ \\ \frac{256 - 25}{20} \\ \\ 11.5[/tex]