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pogo

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223248 
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注册时间
2011-7-11 
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2013-8-23 
1# 跳转到 »
发表于 2011-7-13 15:10 | 显示全部帖子
Anyway, there is no point to memorize formulas like this. Understand the concept and you will be able to produce formula by yourself in a couple of seconds.

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