计算:(1)
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101808360054420/SYS201311031018083600544017_ST/0.png)
(2)lg500+lg
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101808360054420/SYS201311031018083600544017_ST/1.png)
-
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101808360054420/SYS201311031018083600544017_ST/2.png)
.
考点分析:
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