6 3/11 : (9 3/8 - 7 1/2 + 11/20 + 3 23/40) * 5 1/2 * 1 15/23 = 9 целых 1/2
1) 9 3/8 - 7 1/2 = 9 3/8 - 7 4/8 = 8 11/8 - 7 4/8 = 1 целая 7/8
2) 1 7/8 + 11/20 = 1 35/40 + 22/40 = 1 57/40 = 2 целых 17/40
3) 2 17/40 + 3 23/40 = 5 40/40 = 6
4) 6 3/11 : 6 = 69/11 * 1/6 = (23*1)/(11*2) = 23/22
5) 23/22 * 5 1/2 = 23/22 * 11/2 = (23*1)/(2*2) = 23/4
6) 23/4 * 1 15/23 = 23/4 * 38/23 = 38/4 = 9 2/4 = 9 1/2