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2Â¥: Originally posted by feixiaolin at 2015-04-04 17:47:43
1.  =Sum{x1, x1*x2, x1*x2*x3, ¡­}
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1.  =Sum{x1, x1*x2, x1*x2*x3, ¡­}
2. =lim{j--->inf}Sum{x1, x1*x2, x1*x2*x3, ¡­}
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lyiheart

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ÒýÓûØÌû:
2Â¥: Originally posted by feixiaolin at 2015-04-04 17:47:43
1.  =Sum{x1, x1*x2, x1*x2*x3, ¡­}
2. =lim{j--->inf}Sum{x1, x1*x2, x1*x2*x3, ¡­}

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