Завдання 1101 - 1200 » 1178

Обчисліть: 1) –11/2 + (–2,5) + (–3,7) = –1,5 + (–2,5) + (–3,7) = –(1,5 + 2,5 + 3,7) = –7,7; 2) –4/5 + 12/17 + (–0,2) = (–4/5 + (–1/5)) + 12/17 = –1 + 12/17 = –17/17 + 12/17 = –5/17; 3) –0,109 + 864/9 + (–80891/1000) = (–0,109 + (–80,891)) + 864/9 = –81 + 864/9 = 54/9; 4) –5/9 + 1/3 – 4/9 + 2/3 = –9/9 + 3/3 = –1 + 1 = 0; 5) 1513/15 + (–21,34) + 142/15 + (–633/50) = (1513/15 + 142/15) + (–21,34 + (–6,66)) = 30 + (–28) = 2.