Пошаговое объяснение:
а)
-3/8 + (-1/4) = -3/8 - 1/4 = -3/8 - 2/8 = -5/8
б)
-8,2 + 9 3/7 = -8 2/10 + 9 3/7 = -8 14/70 + 9 30/70 = 1 16/70 = 1 8/35
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Пошаговое объяснение:
а)
-3/8 + (-1/4) = -3/8 - 1/4 = -3/8 - 2/8 = -5/8
б)
-8,2 + 9 3/7 = -8 2/10 + 9 3/7 = -8 14/70 + 9 30/70 = 1 16/70 = 1 8/35