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:只写后两步也给满分.)
30. 解:原式·················································································· 4分
········································································································· 5分
6分
29. 解:.
·················································································································· 4分
. 6分
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