Пошаговое объяснение:
1) 3. 3/7 * 14/19 = 24/7 * 14/19 = 24/1 * 2/19 = 48/19 =
2. 10/19
2) 3. 5/8 : 7. 1/4 = 29/8 : 29/4 = 29/8 * 4/29 = 4/8 = 1/2
3) 2. 10/19 - 1/2 = 2. 20/38 - 19/38 = 2. 1/38
4) 2. 1/38 + 8,4 =
2. 1/38 + 8. 4/10 =
2. 5/190 + 8. 76/190 =
10. 81/190
