已知二次函数y=ax2+bx+c(a≠0)的图象如图所示,有下列5个结论:①abc>0②b0④2cm(am+b),(m1)其中正确的结论有.( )A.2个 B.3个 C.4个 D.5个选什么,哪些结论是对的,
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![已知二次函数y=ax2+bx+c(a≠0)的图象如图所示,有下列5个结论:①abc>0②b0④2cm(am+b),(m1)其中正确的结论有.( )A.2个 B.3个 C.4个 D.5个选什么,哪些结论是对的,](/uploads/image/z/8685316-28-6.jpg?t=%E5%B7%B2%E7%9F%A5%E4%BA%8C%E6%AC%A1%E5%87%BD%E6%95%B0y%3Dax2%2Bbx%2Bc%28a%E2%89%A00%29%E7%9A%84%E5%9B%BE%E8%B1%A1%E5%A6%82%E5%9B%BE%E6%89%80%E7%A4%BA%2C%E6%9C%89%E4%B8%8B%E5%88%975%E4%B8%AA%E7%BB%93%E8%AE%BA%3A%E2%91%A0abc%3E0%E2%91%A1b0%E2%91%A32cm%28am%2Bb%29%2C%28m1%29%E5%85%B6%E4%B8%AD%E6%AD%A3%E7%A1%AE%E7%9A%84%E7%BB%93%E8%AE%BA%E6%9C%89.%28+%29A.2%E4%B8%AA+B.3%E4%B8%AA+C.4%E4%B8%AA+D.5%E4%B8%AA%E9%80%89%E4%BB%80%E4%B9%88%2C%E5%93%AA%E4%BA%9B%E7%BB%93%E8%AE%BA%E6%98%AF%E5%AF%B9%E7%9A%84%2C)
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