8 1/3 - (1,3 - 3/4) = 7 47/60
1) 1,3 - 3/4 = 13/10 - 3/4 = 52/40 - 30/40 = 22/40 = 11/20
2) 8 1/3 - 11/20 = 25/3 - 11/20 = 500/60 - 33/60 = 467/60 = 7 47/60
12 1/6 - (3,24 - 2 5/6) = 11,995
1) 3,24 - 2 5/6 = 3 24/100 - 2 5/6 = 3 144/600 - 2 500/600 = 1803/600 - 1700/600 = 103/600
2) 12 1/6 - 103/600 = 73/6 - 103/600 = 7300/600 - 103/600 = 7197/600 = 11,995