1.1 Выполните действия: 1) (1,8 + 1 1/7) : (1,8 – 1 1/7); 2) (1,5 + 1 1/3) : (7,6 - 5 1/3); 3) (23 - 15 1/3) : (-5 1/9); 4) (19 - 13 2/3) : (-7 1/9)

1. 1.8 + 1 1/7 = 1.8 + 8/7 = 18/10 + 8/7 = 9/5 + 8/7 = (63+40)/35 = 103/35. 1.8 - 1 1/7 = 1.8 - 8/7 = 9/5 - 8/7 = (63-40)/35 = 23/35. (103/35) : (23/35) = 103/23 = 4 11/23. 2. 1.5 + 1 1/3 = 3/2 + 4/3 = (9+8)/6 = 17/6. 7.6 - 5 1/3 = 76/10 - 16/3 = 38/5 - 16/3 = (114-80)/15 = 34/15. (17/6) : (34/15) = (17/6) * (15/34) = (17*15)/(6*34) = (1*5)/(2*2) = 5/4 = 1 1/4. 3. 23 - 15 1/3 = 23 - 46/3 = (69-46)/3 = 23/3. -5 1/9 = -46/9. (23/3) : (-46/9) = (23/3) * (-9/46) = (1/1) * (-3/2) = -3/2 = -1 1/2. 4. 19 - 13 2/3 = 19 - 41/3 = (57-41)/3 = 16/3. -7 1/9 = -64/9. (16/3) : (-64/9) = (16/3) * (-9/64) = (1/1) * (-3/4) = -3/4.