7. 2
+2
6. 解：
＝
5. 解：原式=2+1-3+2 ……4分
=2 ……2分
4. 解：原式
························································································ 2分
·········································································································· 5分
···················································································································· 6分
3. 解：原式
········································································ 4分
································································································ 5分
······················································································································ 6分
2. 解：原式=
=
1. 解：原式=2+3-1-2=2
19. 
20. 5 21. < 22. 
23. 
24. 25. 47
12. 
13. 5 14. x≥2 15. 3 ． 16. ±4 17. 
；18. 
(或
+
)；
1. 
2. 1
3. 1 4. 
5. 12 6. 6，4 7. 
8. 4
9. 10. -1 11. 
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