1097. Виконай додавання, обираючи зручну послідовність об- числень: 1) -15 + 9 + (−9) + 15; 2) −35+ (-19) + 28 + 19; 3) 2,47 + (-2,11) + (−7,89) + 6,53; 4) 1,9 + (-3) + (-1,9) + 9 + (-2).​
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