170 целых 8/51 - 2 целых 4/9 : 3 целых 2/3 = 169 целых 25/51
1) 2 4/9 : 3 2/3 = 22/9 : 11/3 = 22/9 * 3/11 = (2*1)/(3*1) = 2/3
2) 170 8/51 - 2/3 = 169 59/51 - 34/51 = 169 25/51
Пояснения:
2 4/9 = (2*9+4)/9 = 22/9
3 2/3 = (3*3+2)/3 = 11/3
2/3 = 34/51 - доп.множ. 17