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