40. 解：原式＝2+1－9+1 ································································································ 4分
＝－5 ······································································································ 6分
39. 解：
38.
解：原式=
37.
解：原式
36. 解：原式=
-2+
1………………………………………………6分
=3-(2-)+1……………………………………………7分
=2+………………………………………………………8分
35.
解：
=
·············································································· 4分
=0 ·················································································································· 6分
34. 解：原式
33. 解：原式＝5+1-
＝5
32. 解：原式= 2－
+－1 =1.
31. 解: 原式＝
�。�
�。�1
(注：只寫后兩步也給滿分.)
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