若一元二次函数f(x)=ax²+bx满足f(2)=0...若一元二次函数f(x)=ax²+bx满足f(2)=0,且f(x)=x有等根,则a=(),b=().求各种精辟回答
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![若一元二次函数f(x)=ax²+bx满足f(2)=0...若一元二次函数f(x)=ax²+bx满足f(2)=0,且f(x)=x有等根,则a=(),b=().求各种精辟回答](/uploads/image/z/2088768-48-8.jpg?t=%E8%8B%A5%E4%B8%80%E5%85%83%E4%BA%8C%E6%AC%A1%E5%87%BD%E6%95%B0f%28x%29%3Dax%26%23178%3B%2Bbx%E6%BB%A1%E8%B6%B3f%282%29%3D0...%E8%8B%A5%E4%B8%80%E5%85%83%E4%BA%8C%E6%AC%A1%E5%87%BD%E6%95%B0f%28x%29%3Dax%26%23178%3B%2Bbx%E6%BB%A1%E8%B6%B3f%282%29%3D0%2C%E4%B8%94f%28x%29%3Dx%E6%9C%89%E7%AD%89%E6%A0%B9%2C%E5%88%99a%3D%28%29%2Cb%3D%28%29.%E6%B1%82%E5%90%84%E7%A7%8D%E7%B2%BE%E8%BE%9F%E5%9B%9E%E7%AD%94)
若一元二次函数f(x)=ax²+bx满足f(2)=0...若一元二次函数f(x)=ax²+bx满足f(2)=0,且f(x)=x有等根,则a=(),b=().求各种精辟回答
若一元二次函数f(x)=ax²+bx满足f(2)=0...
若一元二次函数f(x)=ax²+bx满足f(2)=0,且f(x)=x有等根,则a=(),b=().
求各种精辟回答
若一元二次函数f(x)=ax²+bx满足f(2)=0...若一元二次函数f(x)=ax²+bx满足f(2)=0,且f(x)=x有等根,则a=(),b=().求各种精辟回答
f(2)=0,则4a+2b=0
,f(x)=x有等根,代入原式ax²+(b-1)x=0则(b-1)^2 =0
综上:a=-0.5 b=1
A=-1/2 B=1