Відповідь:
1)
( x-29/31) + 18/31 = 1. 17/31
( x-29/31) = 1. 17/31 - 18/31
( x-29/31) = 48/31-18/21
( x-29/31) = 20/31
x = 20/31 + 29/31
x = 49/31 = 1. 18/31
2)
(x + 21. 3/19 ) - 3. 18/19 = 21. 17/19
(x + 21. 3/19 ) = 21. 17/19 - 3. 18/19
(x + 21. 3/19 ) = 20. 36/19 - 3. 18/19
(x + 21. 3/19 ) = 17. 18/19
x = 17. 18/19 - 21. 3/19
x = - 4. 15/19
3)
5 - 11/14 - 2. 13/14 = 4. 14/14 - 11/14 - 2. 13/14 = 4. 3/14 - 2. 13/14 = 3. 17/14 - 2. 13/14 = 1. 4/14 = 1. 2/7
4)
8. 6/13 - 5. 12/13 = 7. 19/13 - 5. 12/13 = 2. 7/13
5)
17 - 2. 3/4 = 16. 17/17 - 11/4 = 16. 68/68 - 187/68 = 14. 204/68 - 187/68 = 14. 17/68
6)
18 - 5. 11/12 = 17. 18/18 - 5. 11/12 = 17. 36/36 - 5. 33/36 = 12. 3/36 = 12. 1/13
Покрокове пояснення: