[(4 1/3 : (5/6 + 0,25)) : ((7/12 - 2/15) : 0,9)] - [(3,6 * (7/12 + 1/9)) : (5/8 - 1 5/7)] =
= 10 18/61
1) 5/6 + 0,25 = 5/6 + 1/4 = 10/12 + 3/12 = 13/12 = 1 1/12
2) 4 1/3 : 1 1/12 = 13/3 : 13/12 = 13/3 * 12/13 = 12/3 = 4
3) 7/12 - 2/15 = 35/60 - 8/60 = 27/60 = 9/20 = 0,45
4) 0,45 : 0,9 = 0,5
5) 4 : 0,5 = 8
6) 7/12 + 1/9 = 21/36 + 4/36 = 25/36
7) 3,6 * 25/36 = 36/10 * 25/36 = 25/10 = 2,5
8) 5/8 - 1 5/7 = 35/56 - 1 40/56 = - 1 5/56
9) 2,5 : (- 1 5/56) = 25/10 : (- 61/56) = 25/10 * (- 56/61) = - 700/305 = - 2 90/305 = - 2 18/61
10) 8 - (- 2 18/61) = 8 + 2 18/61 = 10 18/61