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zhang1226

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zxbok1979: ½ð±Ò+20, ¡ï¡ï¡ïºÜÓаïÖú 2015-08-09 13:33:55
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wurongjun

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4Â¥: Originally posted by zhang1226 at 2015-08-08 17:44:50
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zhang1226

гæ (³õÈëÎÄ̳)

ÒýÓûØÌû:
5Â¥: Originally posted by wurongjun at 2015-08-08 18:33:49
y=(r,r')
y'=?(Õâ¸öÄã×Ô¼ºÍưÉ)
y'(0)=(r'(0),r''(0))
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