Завдання 201 - 300 » 247

Обчисли: 1) 2/9 + 3/5 = (10 + 27)/45 = 37/45; 2) 4/9 + 1/6 = (8 + 3)/18 = 11/18; 3) 1/18 + 5/12 = (2 + 15)/36 = 17/36; 4) 3/10 + 2/15 = (9 + 4)/30 = 13/30; 5) 6/7 – 2/3 = (18 - 14)/21 = 4/21; 6) 11/12 – 5/6 = (11 - 10)/12 = 1/12; 7) 7/12 – 3/8 =(14 - 9)/24 = 5/24; 8) 9/14 – 17/35 = (45 - 34)/70 = 11/70.