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Yumiz_T 发表于 2013-2-26 08:35 PM P = -6 Roots of the equation are 9 and -3.
吃饱闲空1 发表于 2013-2-26 08:36 PM x^2 - px-27=0 x^2-(sor)x +(por) =0 x^2 - (a+b)x + (ab)=0
︻神ヤ勝┳═一 发表于 2013-2-26 09:33 PM 刚好旁边有纸和笔,就顺便做了一下
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