(3 целых 2/11) * х = 35
35/11 * х = 35
х = 35 : 35/11
х = 35/1 * 11/35
х = 11
(8 целых 5/13) * х = 4 целых 5/26
109/13 * х = 109/26
х = 109/26 : 109/13
х = 109/26 * 13/109
х = 13/26
х = 1/2
Пояснения:
3 целых 2/11 = (3*11+2)/11 = 35/11
8 целых 5/13 = (8*13+5)/13 = 109/13
4 целых 5/26 = (4*26+5)/26 = 109/26
13/26 = 1/2 - сократили на 13