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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