2/5 * 1 1/4 = 2/5 * 5/4 = 2/4 = 1/2
2 1/9 * 4 = 19/9 * 4/1 = 76/9 = 8 4/9
2 1/7 * 1 2/5 = 8/7 * 7/5 = 8/5 = 1 3/5
1 9/11 : 4/5 = 20/9 * 5/4 = 5/9 * 5/1 = 25/9 = 2 7/9
17 : 1 8/9 = 17 : 17/9 = 17 * 9/17 = 9
1 1/14 : 1 2/7 = 15/14 : 9/7 = 15/14 * 7/9 = 5/2 * 1/3 = 7/6
2 1/3 * 3 1/5 - 8 4/9 : 2 = 3 11/45
1) 2 1/3 * 3 1/5 = 7/3 * 16/5 = 112/15 = 7 7/15
2) 8 4/9 : 2 = 76/9 * 1/2 = 38/9 = 4 2/9
3) 7 7/15 - 4 2/9 = 7 21/45 - 4 10/45 = 3 11/45
5 2/7 * 1 1/4 + 5 2/7 * 1 3/4 = 5 2/7 * (1 1/4 + 1 3/4) = 5 2/7 * 3 = 37/7 * 3 = 111/7 = 15 6/7