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Ответ:

Пошаговое объяснение:

2.  -274.93 + 546.3 = 546.3 - 274.93 = 271.37;

4.  -941.3+(-1245.97) = -(941.3+1245.97) = 2197.27;

6.  -16 7/15+(-41 11/12) = -(16 28/60 + 41 55/60) = -57 83/60 = - 58 23/60;

8.  72 2/5 + (-59 1/4) = 72 8/20 - 59 5/20 = 13 3/20.