关于二次函数(求具体过程)一直二次函数解析式y=ax²-(b+1)x-3a的图像经过点P(4,10)交x轴于点A(x₁,0),B(x₂,0)两点(x₁<x₂).交x负半轴于c点,且满足3AO=OB (1)求二次函数解析
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