1целая8/13делить х=7/26
1 8/13 : х = 7/26 х= 1 8/13 : 7/26 = 21/13 * 26/7 = (3*2) /(1*1) х=6 проверим: 1 8/13 : 6 = 7/26 21/13 * 1/6 = 7/26 (7*1)/(13*2) = 7/26 7/26=7/26