2 1096. Виконай додавання, обираючи зручну послідовність обчислень: 1)-9 + 6+ (-6) + 9; 2) 42 + (-10) + (-39) + 10; 3) -2,63 + 5,28 + 1,72 + (-8,37); 4) -2,43 + 6 + 2,43 + (-8) + 2.​
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