Ответ:

[tex] | - 4.8| + | - 2.7| = 4.8 + 2.7 = 7.5[/tex]

[tex] | - 13.8| - 7.5 = 13.8 - 7.5 = 6.3[/tex]

[tex]6.8 \div | - 1.7| = 6.8 \div 1.7 = 4[/tex]

[tex] |2.5| \times | - 3| = 2.5 \times 3 = 7.5[/tex]