Пошаговое объяснение:
1)
х + 4. 3/8 = 12. 1/2
х = 12. 1/2 - 4. 3/8
х = 12. 4/8 - 4. 3/8
х = 8. 1/8
2)
х - 2/7 = 1. 3/7
х = 1. 3/7 + 2/7
х = 1. 5/7
3)
х - 1. 7/12 = 3/4
х = 3/4 + 1. 7/12
х = 9/12 + 1. 7/12
х = 1. 16/12
х = 2. 4/12
х = 2. 1/3
4)
3/4 : х = 1. 1/2
3/4 : х = 3/2
х = 3/4 : 3/2
х = 3/4 * 2/3
х = 2/4
х = 1/2
5)
х : 7/8 = 3. 3/7
х : 7/8 = 24/7
х = 24/7 * 7/8
х = 24/8
х = 3
6)
8 : х = 2/9
х = 8 : 2/9
х = 8 * 9/2
x = 4 * 9/1
х = 36/1
х = 36
