Ответ:
-9.8+(+1.8)-(+3.1)-(-1.2)=-9.8+1.8-3.1+1.2=-8-1,9=-9.9
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Ответ:
-9.8+(+1.8)-(+3.1)-(-1.2)=-9.8+1.8-3.1+1.2=-8-1,9=-9.9