Пошаговое объяснение:
1) 7. 1/2 * 2. 2/3 = 15/2 * 8/3 = 5/1 * 4/1 = 20/1 = 20
2) 12. 1/4 : 7/9 = 49/4 : 7/9 = 49/4 * 9/7 = 7/4 * 9/1 = 63/4 = 15. 3/4
3) 20 - 15. 3/4 = 19. 4/4 - 15. 3/4 = 4. 1/4
4) 4. 1/4 : 6 = 17/4 * 1/6 = 17/24
5) 17/24 * 3. 1/8 = 17/24 * 25/8 = 425/192 = 2. 41/192
6) 2. 41/192 + 5. 2/7 =
2. 287/1344 + 5. 384/1344 = 7. 671/1344
Пошаговое объяснение:
Пошаговое объяснение:
1) 7. 1/2 * 2. 2/3 = 15/2 * 8/3 = 5/1 * 4/1 = 20/1 = 20
2) 12. 1/4 : 7/9 = 49/4 : 7/9 = 49/4 * 9/7 = 7/4 * 9/1 = 63/4 = 15. 3/4
3) 20 - 15. 3/4 = 19. 4/4 - 15. 3/4 = 4. 1/4
4) 4. 1/4 : 6 = 17/4 * 1/6 = 17/24
5) 17/24 * 3. 1/8 = 17/24 * 25/8 = 425/192 = 2. 41/192
6) 2. 41/192 + 5. 2/7 =
2. 287/1344 + 5. 384/1344 = 7. 671/1344