抛物线y=ax^2+bx+c的图象如图所示,则有下列结论:①abc>0;②a+b+c=2;③a>1抛物线y=ax^2+bx+c的图象如图所示,则有下列结论:①abc>0;②a+b+c=2;③a>1/2;④b<1其中正确的是(重点解释②③)
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![抛物线y=ax^2+bx+c的图象如图所示,则有下列结论:①abc>0;②a+b+c=2;③a>1抛物线y=ax^2+bx+c的图象如图所示,则有下列结论:①abc>0;②a+b+c=2;③a>1/2;④b<1其中正确的是(重点解释②③)](/uploads/image/z/10320411-3-1.jpg?t=%E6%8A%9B%E7%89%A9%E7%BA%BFy%3Dax%5E2%2Bbx%2Bc%E7%9A%84%E5%9B%BE%E8%B1%A1%E5%A6%82%E5%9B%BE%E6%89%80%E7%A4%BA%2C%E5%88%99%E6%9C%89%E4%B8%8B%E5%88%97%E7%BB%93%E8%AE%BA%3A%E2%91%A0abc%3E0%3B%E2%91%A1a%2Bb%2Bc%3D2%3B%E2%91%A2a%3E1%E6%8A%9B%E7%89%A9%E7%BA%BFy%3Dax%5E2%2Bbx%2Bc%E7%9A%84%E5%9B%BE%E8%B1%A1%E5%A6%82%E5%9B%BE%E6%89%80%E7%A4%BA%2C%E5%88%99%E6%9C%89%E4%B8%8B%E5%88%97%E7%BB%93%E8%AE%BA%3A%E2%91%A0abc%26gt%3B0%3B%E2%91%A1a%2Bb%2Bc%3D2%3B%E2%91%A2a%26gt%3B1%2F2%3B%E2%91%A3b%26lt%3B1%E5%85%B6%E4%B8%AD%E6%AD%A3%E7%A1%AE%E7%9A%84%E6%98%AF%28%E9%87%8D%E7%82%B9%E8%A7%A3%E9%87%8A%E2%91%A1%E2%91%A2%29)
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