Вправи 901 - 1000 » 937

Обчисліть значення виразу: 1) –1/4 + 3/5 = –5/20 + 12/20 = 7/20; 2) 9/11 + (–2/5) = 45/55 + (–22/55) = 23/55; 3) –20/21 + 3/7 = –20/21 + 9/21 = 11/21; 4) 75/12 + (–37/24) = 710/24 + (–37/24) = 43/24 = 41/8; 5) –611/12 + (–813/18) = –633/36 + (–826/36) = –1459/36 = –1523/36; 6) –512/35 + 10 = –512/35 + 935/35 = 423/35; 7) –31/12 + 1/6 = –213/12 + 2/12 = –211/12; 8) 36/7 + (–64/9) = 354/63 + (–591/63) = –237/63; 9) 91/6 + (–53/4) = 814/12 + (–59/12) = 35/12.