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Author: 乌贼

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其妙 Posted 2016-7-4 21:33
WC!竟然真把你给叫粗来了,看来其实你一直暗中看着嘛
kuing 发表于 2016-7-2 17:41

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isee Posted 2016-7-5 00:26
回复  isee

$\rmd(2x+y)/\rmd x=2+y'$ 呗
kuing 发表于 2016-7-3 17:57

原来如此

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