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11Â¥2014-06-03 12:31:26
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10Â¥: Originally posted by jjxyl3315 at 2014-06-03 12:24:09
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12Â¥2014-06-03 17:10:16
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12Â¥: Originally posted by vect at 2014-06-03 17:10:16
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[1/(x+dx)-1/x]/(1/x)=dx/(x+dx)=?????


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13Â¥2014-06-03 20:17:40
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vect

ÖÁ×ðľ³æ (ÖøÃûдÊÖ)

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13Â¥: Originally posted by jjxyl3315 at 2014-06-03 20:17:40
/(1/x)=dx/(x+dx)=?????


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‡å£¬·Öĸͨ·Ö£¬ºóÃæ³ýÒÔÏ൱ÓÚ³ËÒÔx,ËùÒÔµÃ[(x-(x+dx))/x/(x+dx)]*x=-dx/(x+dx)
14Â¥2014-06-03 20:49:07
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KING20122011

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2Â¥: Originally posted by Edstrayer at 2014-05-31 18:43:30
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15Â¥2014-06-03 20:54:30
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