| 1) | 1 1 2- + - 3 5 | 2) | 1 1 3- -  4- 8 9 |
| 3) | 1 1 2- + - 5 12 | 4) | 1 1 3- -  3- 7 9 |
| 5) | 1 1 2- + - 6 10 | 6) | 1 1 2- -  2- 4 4 |
| 7) | 1 1 1- + - 3 12 | 8) | 1 1 1- -  4- 7 3 |
| 9) | 1 1 2- + - 3 6 | 10) | 1 1 4- -  2- 7 5 |
| 11) | 1 1 1- + - 6 11 | 12) | 1 1 1- -  3- 8 5 |
| 13) | 1 1 1- + - 2 6 | 14) | 1 1 1- -  2- 8 3 |
| 15) | 1 1 2- + - 3 5 | 16) | 1 1 4- -  2- 4 6 |
| 17) | 1 1 1- + - 5 6 | 18) | 1 1 5- -  3- 6 4 |
| 19) | 1 1 1- + - 4 8 | 20) | 1 1 4- -  4- 9 9 |
| 21) | 1 1 1- + - 2 3 | 22) | 1 1 4- -  2- 8 7 |
Joke:
If your friend says education is expensive, ask him to try ignorance!