10. 解：原式
9. 解：原式
································ (4分)
8. 解：原式＝
＝
＝2
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
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