题目列表(包括答案和解析)
43. -2b
|
····················································································· (3分)
=
··································································································· (6分)
42. 解：原式＝1+3－1＝3
41. 解：原式
＝－2
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
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