3 целых 5/18 * 6/11 - 1 целая 1/3 = 5/11
1) 3 5/18 * 6/11 = 59/18 * 6/11 = (59*1)/(3*11) = 59/33 = 1 целая 26/33
2) 1 26/33 - 1 1/3 = 1 26/33 - 1 11/33 = 15/33 = 5/11
Пояснения:
3 целых 5/18 = (3*18+5)/18 = 59/18
1/3 = 11/33 - доп.множ. 11
15/33 = 5/11 - сократили на 3