Найдите значение выражения: 

А)   | - 2,8 |   -   | - 1,3 |     =          

B)   | - 3,3 |   +   | - 2,1 |    =          

C)   | - 11,5 |   -   | 7,9 |     =          

D)   | 12,8 |   +   | - 13,9 |   =          
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