Дроби 1)3/4-1/1+1/2, 2) 4/9+5/6-3/4, 3)4/15-2/45+7/9, 4)6/7-1/4+5/14, 6)11/12-1/9+1/4, 5) 7/10+9/14-3/35,

1. 1) 3/4 - 1/1 = 3/4 - 4/4 = - 1/4;2) - 1/4 + 1/2 = - 1/4 + 2/4 = 1/4.Ответ: 1/4.2. 1) 4/9 + 5/6 = 8/18 + 15/18 = 23/18 = 1 5/18;2) 1 5/18 - 3/4 = 1 10/36 - 27/36 = 46/36 - 27/36 = 19/36.Ответ: 19/36.3. 1) 4/15 - 2/45 = 12/45 - 2/45 = 10/45 = 2/9;2) 2/9 + 7/9 = 9/9 = 1.Ответ: 1.4. 1) 6/7 - 1/4 = 24/28 - 7/28 = 17/28;2) 17/28 + 5/14 = 17/28 + 10/28 = 27/28.Ответ: 27/28.5. 1) 7/10 + 9/14 - 49/70 + 45/70 = 94/70 = 1 24/70 = 1 12/35;2) 1 12/35 - 3/35 = 1 9/35.Ответ: 1 9/35.6. 1) 11/12 - 1/9 = 33/36 - 4/36 = 29/36;2) 29/36 + 1/4 = 29/36 + 9/36 = 38/36 = 1 2/36 = 1 1/18.Ответ: 1 1/18.