Решите, дам 10 баллов. (все действия с дробями) 5/6 - (7/15 - 17/20) ÷ 1(цел.) 1/45 -5/9 - 1 43/72 ÷ (7/24 + 3/16)

5/6 - (7/15 - 17/20) : 1 1/45 = 1 целая 5/24 1) 7/15 - 17/20 = 28/60 - 51/60 = - 23/60 2) - 23/60 : 1 1/45 = - 23/60 : 46/45 = - 23/60 * 45/46 = - (1*3)/(4*2) = = - 3/8 3) 5/6 - (- 3/8) = 20/24 + 9/24 = 29/24 = 1 целая 5/24  Пояснения: 7/15 = 28/60 - доп.множ. 4 17/20 = 51/60 - доп.множ. 3 5/6 = 20/24 - доп.множ. 4 3/8 = 9/24 - доп.множ. 3  - 5/9 - 1 43/72 : (7/24 + 3/16) = - 3 целых 8/9 1) 7/24 + 3/16 = 14/48 + 9/48 = 23/48 2) 1 43/72 : 23/48 = 115/72 * 48/23 = (115*2)/(3*23) = 230/69 = 3 целых 23/69 = 3 целых 1/3 3) - 5/9 - 3 1/3 = - 5/9 - 3 3/9 = - 3 целых 8/9 Пояснения: 7/24 = 14/48 - доп.множ. 2 3/16 = 9/48 - доп.множ. 3 1 целая 43/72 = (1*72+43)/72 = 115/72 1/3 = 3/9 - доп.множ. 3