Номер 851
Розв’яжіть рівняння:
| 1) 7 | 7 | – (5 | 11 | – y) = 3 | 19 | ; |
| 30 | 30 | 30 |
| 5 | 11 | – y = 7 | 7 | – 3 | 19 | ; |
| 30 | 30 | 30 |
| 5 | 11 | – y = 6 | 37 | – 3 | 19 | ; |
| 30 | 30 | 30 |
| 5 | 11 | – y = 3 | 18 | ; |
| 30 | 30 |
| y = 4 | 41 | – 3 | 18 | ; |
| 30 | 30 |
| y = 1 | 23 | ; |
| 30 |
| 2) (x – 1 | 9 | ) + 2 | 14 | = 5 | 5 | ; |
| 17 | 17 | 17 |
| (x – 1 | 9 | ) = 5 | 5 | – 2 | 14 | ; |
| 17 | 17 | 17 |
| (x – 1 | 9 | ) = 4 | 22 | – 2 | 14 | ; |
| 17 | 17 | 17 |
| (x – 1 | 9 | ) = 2 | 8 | ; |
| 17 | 17 |
| x = 2 | 8 | + 1 | 9 | ; |
| 17 | 17 |
| x = 3 | 17 | ; |
| 17 |
x = 4.