Вправи 901 - 1000 » 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) 7/16 + (–11/42) + (–9/16) + 17/42 = (7/16 + (–9/16)) + (–11/42 + 17/42) = –2/16 + 6/42 = –1/8 + 1/7 = (-7+ 8)/56 = 1/56; 4) –9/40 + 13/50 + (–23/50) + 19/40 = (–9/40 + 19/40) + (+13/50 + (–23/50)) = 10/40 + (–10/50) = 5/20 + (–4/20) = 1/20; 5) –331/36 + (–117/24) + 54/36 + (–24/24) = (–117/24 + (–24/24)) + (–331/36 + 54/36) = –321/24 + (–331/36 + 440/36) = –37/8 + 19/36 = –37/8 + 12/8 = –25/8.