Завдання 1001 - 1100 » 1057

Обчисли: 1) 5,75 + (–3,83) = 5,75 – 3,83 = 1,92; 2) –5,5 + 7,23 = 7,23 – 5,5 = 1,73; 3) –1 + 1,138 = 1,138 – 1 = 0,138; 4) 5,9 + (–5,9) = 0; 5) – 3/4 + 1/6 = – (3/4 – 1/6) = – (9-2)/12 = – 7/12; 6) 5/18 + (–7/24) = 20/72 + (–21/72) = –(21/72 – 20/72) = –1/72; 7) – 7/13 + 1 = 1 – 7/13 = 13/13 – 7/13 = 6/13; 8) 5/42 + (–11/63) = 15/126 + (–22/126) = –(22/126 – 15/126) = – 7/126 = –1/18; 9) – 17/18 + 13/24 = – 68/72 + 39/72 = –(68/72 – 39/72) = – 29/72.