Simplify each of the following rational expressions :
Problem 1 :
Problem 2 :
Problem 3 :
Problem 4 :
Problem 5 :
Problem 6 :
Problem 7 :
Problem 8 :
Problem 9 :
Problem 10 :
Problem 11 :
Problem 12 :
Problem 13 :
Problem 14 :
Problem 15 :
Problem 16 :
Problem 17 :
Problem 18 :
1. Answer :
2. Answer :
3. Answer :
4. Answer :
5. Answer :
6. Answer :
7. Answer :
8. Answer :
9. Answer :
10. Answer :
11. Answer :
12. Answer :
13. Answer :
14. Answer :
15. Answer :