到底如何判断是不是一元二次方程啊?一个白痴问题 ,给我搞糊涂了!到底是 1) 不整理 直接看,还是2)整理以后再看?例:A:1 + (1/x) = xB:x^2/(x^2 +1) = 3/(x^2 + 1)C:(2x +2)/(x+1) = x^2D:x^2/(x+1) = 3/(x+1) E:(x-2)^2 =

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