8 / 17 * 3 2/5 : 11/12 *2 1/5 : 4/9
8/17 * 3 2/5 : 11/12 * 2 1/5 : 4/9 = 8 16/25
1) 8/17 * 3 2/5 = 8/17 * 17/5 = 8/5
2) 8/5 : 11/12 = 8/5 * 12/11 = 96/55
3) 96/55 * 2 1/5 = 96/55 * 11/5 = 96/25
4) 96/25 : 4/9 = 96/25 * 9/4 = 216/25 = 8 16/25