6_4/9 * 1_7/29 - (9_1/6 - 3_3/4) : 4_1/6 = 6,7
2 4 1 3
1) 9_1/6 - 3_3/4 = 9_2/12 - 3_9/12 = 8_14/12 - 3_9/12 = 5_5/12
2) 6_4/9 * 1_7/29 = 58/9 * 36/29 = (58*36) / (9*29) = 2*4 = 8
3) 5_5/12 : 4_1/6 = 65 / 12 : 25/6 = (65*6) / (12*25) = 13/10 = 1,3
4) 8-1,3 = 6,7