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- UID
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- 帖子
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- 2011-7-11
- 最后登录
- 2013-8-23
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| Well, I don’t have the books with me, but clearly you can’t cross multiply and cancel with the ratios you have stated. You would have to take the inverse of C/B to get to B/C and cancel out the “B’s”. |
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发表于 2013-4-28 08:11
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