Частина 2 — Вправи: 1178

1178. Обчисліть:

1) –112 + (–2,5) + (–3,7) = –1,5 + (–2,5) + (–3,7) = –(1,5 + 2,5 + 3,7) = –7,7;

2) –45 + 1217 + (–0,2) = (–45 + (–15)) + 1217 = –1 + 1217 = –1717 + 1217 = –517;

3) –0,109 + 8649 + (–808911000) = (–0,109 + (–80,891)) + 8649 = –81 + 8649 = 549;

4) –59 + 13 – 49 + 23 = –99 + 33 = –1 + 1 = 0;

5) 151315 + (–21,34) + 14215 + (–63350) = (151315 + 14215) + (–21,34 + (–6,66)) = 30 + (–28) = 2.