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- UID
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- 帖子
- 213
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- 2011-7-11
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- 2014-8-7
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Thank you cpk123.
I know it works, this is what I’ve been using (and it also makes sense!!).
However, I am really confused about the CFAI one, I cannot understand the logic behind it (and couldn’t make them equal algebraicly.. ) |
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发表于 2013-5-4 14:29
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