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haiyoufeihu

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2Â¥: Originally posted by feixiaolin at 2013-09-09 16:24:01
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exp(4x) + 4 xexp(4x)=0£»
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exp(4x) + 4 C=0£»Ä¿²â C>0 µÄ»°£¬Î޽⡣
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exp(4x) = - 4 C£»
x=ln(- 4C)/4£»

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daiben06

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9Â¥: Originally posted by zjl20111015 at 2013-09-10 12:32:22
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feixiaolin

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11Â¥: Originally posted by haiyoufeihu at 2013-09-10 15:03:29
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