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$y=x^3-3x+c=(x-1)^2(x+c)$或$y=x^3-3x+c=(x+1)^2(x+c)$ 其妙 发表于 2013-12-9 17:55
回复 大王八 2楼的f(正负一)就等于0 其妙 发表于 2013-12-9 22:52
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