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3Â¥: Originally posted by pippi6 at 2013-06-02 14:00:17
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2Â¥: Originally posted by pippi6 at 2013-06-02 13:57:57
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\pi=\pi(R_A+R_B)d

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4Â¥: Originally posted by mashuailing at 2013-06-02 14:09:12
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