Выполните действия: 8/9-2/9+5/18, 8/9-4/30+11/15 прошу

8/9 - 2/9 + 5/18 = 8 * 2 / 9 * 2 - 2 * 2 / 9 * 2 + 5/18 = 16/18 - 4/18 + 5/18 = 12/18 + 5/18 =17/18; 8/9 - 4/30 + 11/15 = 8 * 10 / 90 * 10 - 4 * 3 / 30 * 3 + 11 * 6 / 15 * 6 = 80/90 - 12/90 + + 66/90 = 68/90 + 66/90 = 134/90 = 134 :2 / 90 : 2 = 67/45 = 1 21/45.