(1)计算:(-1)
2008-(
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101408135202971/SYS201311031014081352029001_ST/0.png)
)
-2+
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101408135202971/SYS201311031014081352029001_ST/1.png)
-cos60°;
(2)课堂上,李老师出了这样一道题,已知x=2008-5
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101408135202971/SYS201311031014081352029001_ST/2.png)
,求代数式
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101408135202971/SYS201311031014081352029001_ST/3.png)
的值,小明觉得直接代入计算太繁了,请你来帮他解决,并写出具体过程.
考点分析:
相关试题推荐
(1)计算:
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101408135202971/SYS201311031014081352029000_ST/0.png)
sin60°-
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101408135202971/SYS201311031014081352029000_ST/1.png)
cos45°+
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101408135202971/SYS201311031014081352029000_ST/2.png)
;
(2)解方程:
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101408135202971/SYS201311031014081352029000_ST/3.png)
.
查看答案
计算:cos45°•(-
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101408135097466/SYS201311031014081350974029_ST/0.png)
)
-2-(2
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101408135097466/SYS201311031014081350974029_ST/1.png)
-
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101408135097466/SYS201311031014081350974029_ST/2.png)
)
+|-
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101408135097466/SYS201311031014081350974029_ST/3.png)
|+
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101408135097466/SYS201311031014081350974029_ST/4.png)
.
查看答案
计算:(2+
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101408135097466/SYS201311031014081350974028_ST/0.png)
)(2-
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101408135097466/SYS201311031014081350974028_ST/1.png)
)
2+(
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101408135097466/SYS201311031014081350974028_ST/2.png)
)
+
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101408135097466/SYS201311031014081350974028_ST/3.png)
-2(cos30°+sin30°)+(0.5)
-1.
查看答案
计算:
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101408135097466/SYS201311031014081350974027_ST/0.png)
-(3.14-π)
-3tan30°+(
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101408135097466/SYS201311031014081350974027_ST/1.png)
.
查看答案
计算:|-2|+2sin30°-(-
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131103101408135097466/SYS201311031014081350974026_ST/0.png)
)
2+(tan45°)
-1.
查看答案