3+1/5/12+1/3)+(2+1/3+3/4)-(1+1/1+2/3).решите

1) 1/5 : 12 = 1/5 * 1/12 = 1/60 ;2) 3 + 1/60 = 3 1/60 ;3) 3 1/60 + 1/3 = 181/60 + 1/3 = (181 * 1 + 1 * 20)/60 = 201/60 = 67/20 = 3 7/20 ;4) 2 + 1/3 = 2 1/3 ;5) 2 1/3 + 3/4 = 7/3 + 3/4 = (7 * 4 + 3 * 3)/12 = (28 + 9)/12 = 37/12 = 3 1/12 ;6) 1 + 1/1 = 1 + 1 = 2 ;7) 2 + 2/3 = 2 2/3 ;8) 3 7/20 + 3 1/12 = 67/20 + 37/12 = (67 * 3 + 37 * 5)/60 = (201 + 185)/60 = 386/60 = 193/30 = 6 13/30 ;9)6 13/30 - 2 2/3 = 193/30 - 8/3 = (193 * 1 - 8 * 10)/30 = (193 - 80)/30 = 113/30 = 3 23/30 .Ответ : 3 23/30 .