Ответ: 0,021 × 100% = 2,1%
А.1,2
Б.1,2,3,6
в.1,2,3,4,6,12
г.1,2,4,8,16
д.1,2,3,6,9,18
е.1,2,4,5,10,20
ж.1
з.1,2,3,4,6,8,12,14,16,22,24,48
1 5/7-4 3/13:1 19/26 = -46/63
1) 4 3/13 : 1 19/26 = 55/13 : 45/26 = 55/13 * 26/45 = 22/9 = 2 4/9
2) 1 5/7 - 2 4/9 = 1 45/63 - 2 28/63 = -46/63