хелп 2 2/3+1 4/5*3 1/3- 2 5/6

2 2/3+1 4/5*3 1/3- 2 5/6  = 8/3 + 9/5*10/3-17/6 == 8/3+90/15-17/6 = 8/3+6-17/6 =16/6+36/6-17/6 = 35/6 = 5 5/6