Завдання 1001 - 1100 » 1056

Виконай додавання: 1) –4,254 + 6,44 = 6,44 – 4,254 = 2,186; 2) –6,7 + 5,9 = –(6,7 – 5,9) = –0,8; 3) –4,8 + 4,8 = 0; 4) 0,8957 + (–1) = –(1 – 0,8957) = –0,1043; 5) 5/12 + (–7/9) = 15/36 + (–28/36) = –(28/36 – 15/36) = – 13/36; 6) – 11/42 + 5/28 = – 22/84 + 15/84 = –(22/84 – 15/84) = – 7/84 = – 1/12; 7) 1 + (–11/38) = 1 – 11/38 = 38/38 – 11/38 = 27/38; 8) 7/10 + (–9/14) = 49/70 + (–45/70) = 49/70 – 45/70 = 4/70 = 2/35; 9) – 4/25 + 7/15 = – 12/75 + 35/75 = (35 - 12)/75 = 23/75.