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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![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 =](/uploads/image/z/3715437-21-7.jpg?t=%E5%88%B0%E5%BA%95%E5%A6%82%E4%BD%95%E5%88%A4%E6%96%AD%E6%98%AF%E4%B8%8D%E6%98%AF%E4%B8%80%E5%85%83%E4%BA%8C%E6%AC%A1%E6%96%B9%E7%A8%8B%E5%95%8A%3F%E4%B8%80%E4%B8%AA%E7%99%BD%E7%97%B4%E9%97%AE%E9%A2%98+%2C%E7%BB%99%E6%88%91%E6%90%9E%E7%B3%8A%E6%B6%82%E4%BA%86%21%E5%88%B0%E5%BA%95%E6%98%AF+1%29+%E4%B8%8D%E6%95%B4%E7%90%86+%E7%9B%B4%E6%8E%A5%E7%9C%8B%2C%E8%BF%98%E6%98%AF2%29%E6%95%B4%E7%90%86%E4%BB%A5%E5%90%8E%E5%86%8D%E7%9C%8B%3F%E4%BE%8B%3AA%3A1+%2B+%281%2Fx%29+%3D+xB%3Ax%5E2%2F%28x%5E2+%2B1%29+%3D+3%2F%28x%5E2+%2B+1%29C%3A%282x+%2B2%29%2F%28x%2B1%29+%3D+x%5E2D%3Ax%5E2%2F%28x%2B1%29+%3D+3%2F%28x%2B1%29+E%3A%28x-2%29%5E2+%3D)
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