41.(2008湖南常德市)计算:
解:原式=-2
40.(2008湖南益阳市)计算:
解:原式=2+1-9+1 ····························· 4分
=-5 ····························· 6分
39. (2008浙江温州)计算:
解:
38.(2008江苏淮安)计算
解:原式=
37.(2008山东济宁)计算:(,结果精确到0.01)
解:原式
36.(2008泰州市)计算:.
解:原式=-2+1………………………………………………6分
=3-(2-)+1……………………………………………7分
=2+………………………………………………………8分
35..(2008湘潭市)计算:
解:=······················ 4分
=0 ································ 6分
34.(2008永州市)计算:cos45°·(-)-2?-(2-)0+|-|+
解:原式
33.(2008浙江湖州)计算:
解:原式=5+1-=5
32.(2008江苏盐城)计算:.
解:原式= 2-+-1 =1.
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