23 : (6 5/17 + 1 12/17) - (4 2/5 - 2 3/5) : 5 = 2 103/200,
1) 6 5/17 + 1 12/17 = (6 + 1) + (5/17 + 12/17) = 7 + 17/17 = 7 + 1 = 8,
2) 23 : 8 = 23/8 = 2 7/8,
3) 4 2/5 - 2 3/5 = 22/5 - 13/5 = 9/5 = 1 4/5,
4) 1 4/5 : 5 = 9/5 * 1/5 = 9/25,
5) 2 7/8 - 9/25= 2+ 7/8- 9/25= 2+ (175/200- 72/200)= 2+ 103/200= 2 103/200