Завдання 1101 - 1200 » 1129

Виконай віднімання: 1) 2/9 – (– 1/6) = 2/9 + 1/6 = (4 + 3)/18 = 7/18; 2) – 3/8 – (–7/10) = – 3/8 + 7/10 = 7/10 – 3/8 = (28 - 15)/40 = 13/40; 3) 7/12 – 13/18 = 7/12 + (–13/18) = 21/36 + (–26/36) = – 5/36; 4) – 11/12 – 8/9 = – 11/12 + (–8/9) = – (33 + 32)/36 = – 65/36 = –129/36.