Вправи 901 - 1000 » 957

Знайдіть значення виразу: 1) 43 + (–60) + 12 + 39 + (–21) = (43 + 12 + 39) + (–60 + (–21)) = = 94 + (–81) = 13; 2) –1,23 + 2,14 + 7,38 + (–5,77) + 1,62 = (–1,23 + (–5,77)) + 2,14 + (7,38 + 1,62) = –7 + 2,14+ 9 = 4,14; 3) – 3/7 + 14/19 + (–4/7) + 35/19 = (–3/7 + (–4/7)) + (14/19 + 35/19) = –1 + 4 = 3; 4) – 5/18 + (–4/81) + 7/18 + 13/81 = (–5/18 + 7/18) + (–4/81 + 13/81) = 2/18 + 9/81 = 1/9 + 1/9 = 2/9; 5) –35/11 + 13/8 + 25/16 + (–46/11) = –35/11 – 46/11 + 13/8 + 25/16 = –8 + 311/16 = –45/16.