设二次方程ax方+2bx+1=0,cx方+2dx+1=0(a,c不等于零)中a+c=2bd,求证两个方程至少有一个方程有实根.希望有过程,我等着 直接选最佳
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![设二次方程ax方+2bx+1=0,cx方+2dx+1=0(a,c不等于零)中a+c=2bd,求证两个方程至少有一个方程有实根.希望有过程,我等着 直接选最佳](/uploads/image/z/1624478-14-8.jpg?t=%E8%AE%BE%E4%BA%8C%E6%AC%A1%E6%96%B9%E7%A8%8Bax%E6%96%B9%2B2bx%2B1%3D0%2Ccx%E6%96%B9%2B2dx%2B1%3D0%EF%BC%88a%2Cc%E4%B8%8D%E7%AD%89%E4%BA%8E%E9%9B%B6%EF%BC%89%E4%B8%ADa%2Bc%3D2bd%2C%E6%B1%82%E8%AF%81%E4%B8%A4%E4%B8%AA%E6%96%B9%E7%A8%8B%E8%87%B3%E5%B0%91%E6%9C%89%E4%B8%80%E4%B8%AA%E6%96%B9%E7%A8%8B%E6%9C%89%E5%AE%9E%E6%A0%B9.%E5%B8%8C%E6%9C%9B%E6%9C%89%E8%BF%87%E7%A8%8B%2C%E6%88%91%E7%AD%89%E7%9D%80+%E7%9B%B4%E6%8E%A5%E9%80%89%E6%9C%80%E4%BD%B3)
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