Решите пример с пропорциями :
1целая3/34:(1/13х)=1целая43/68:3/26

1 3/34 :1/13 х=1 43/68 : 3/261/13 х * 1 43/68=3/26 * 1 3/341/13 * 111/68 х=3/26 * 37/34111/884 х=111/884х=111/884 : 111/884х=111/884 * 8884/111х=1