计算:
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101193618149953118/SYS201311011936181499531012_ST/0.png)
-(
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101193618149953118/SYS201311011936181499531012_ST/1.png)
)
+(-
![manfen5.com 满分网](http://img.manfen5.com/res/CZSX/web/STSource/20131101193618149953118/SYS201311011936181499531012_ST/2.png)
)
-1+tan60°.
考点分析:
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