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回复 青青子衿 楼主是在开玩笑么......... $f'(x)=e^{-x}[-x^3+(3-a)x^2+(2a-b)x+b-1]$ 这货无论如何 ... 战巡 发表于 2013-11-30 06:42
回复 青青子衿 楼主是在开玩笑么......... \[f'(x)=e^{-x}[-x^3+(3-a)x^2+(2a-b)x+b-1]\] 这货无论如何 ... 战巡 发表于 2013-11-30 06:42
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