9/15*5/12+6:12/25-4/7:3/14

9/15 * 5/12 + 6 : 12/25 - 4/7 : 3/14 = 1/4 + 6 : 12/25 - 4/7 : 3/14 = 1/4 + 25/2 - 4/7 : 3/14 = 1/4 + 25/2 - 8/3 = 51/4 - 8/3 = 121/12 = 10 1/12.

1) 9/15 * 5/12 = 3/3 * 1/4 = 1 * 1/4 = 1/4;

2) 6 : 12/25 = 6/1 : 12/25 = 6/1 * 25/12 = 1/1 * 25/2 = 25/2;

3) 4/7 : 3/14 = 4/7 * 14/3 = 4/1 * 2/3 = 8/3;

4) 1/4 + 25/2 = 1/4 + 50/4 = 51/4;

5) 51/4 - 8/3 = 153/12 - 32/12 = 121/12 = 10 1/12.

Ответ: 9/15 * 5/12 + 6 : 12/25 - 4/7 : 3/14 = 121/12 = 10 1/12.