Частина 2 — Вправи: 956

956. Знайдіть значення виразу:

1) –78 + 36 + 19 + (–22) + (–25) = (–78 + (–22) + (–25)) + (36 + 19) = –125 + 55 = –70;

2) 0,74 + (–9,39) + 3,26 + (–10,61) + 5,25 = (–9,39 + (–10,61)) + (0,74 + 3,26) + 5,25 = –20 + 4 + 5,25 = –20 + 9,25 = –10,75;

3) 716 + (–1142) + (–916) + 1742 = (716 + (–916)) + (–1142 + 1742) = –216 + 642 = –18 + 17 = -7+ 856 = 156;

4) –940 + 1350 + (–2350) + 1940 = (–940 + 1940) + (+1350 + (–2350)) = 1040 + (–1050) = 520 + (–420) = 120;

5) –33136 + (–11724) + 5436 + (–2424) = (–11724 + (–2424)) + (–33136 + 5436) = –32124 + (–33136 + 44036) = –378 + 1936 = –378 + 128 = –258.