已知二次函数f(x)=ax^2+bx(a b为常数,a不等于0)满足条件f(2)=0,方程f(x)=x有等根.(1)求f(x)的解析式(2)问是否存在实数m,n(m<n),使f(x)的定义域和值域分别为[m,n]和[2m,2n]?如存在,写出m,n的值.如不存在.
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![已知二次函数f(x)=ax^2+bx(a b为常数,a不等于0)满足条件f(2)=0,方程f(x)=x有等根.(1)求f(x)的解析式(2)问是否存在实数m,n(m<n),使f(x)的定义域和值域分别为[m,n]和[2m,2n]?如存在,写出m,n的值.如不存在.](/uploads/image/z/995666-50-6.jpg?t=%E5%B7%B2%E7%9F%A5%E4%BA%8C%E6%AC%A1%E5%87%BD%E6%95%B0f%EF%BC%88x%EF%BC%89%3Dax%5E2%2Bbx%28a+b%E4%B8%BA%E5%B8%B8%E6%95%B0%2Ca%E4%B8%8D%E7%AD%89%E4%BA%8E0%29%E6%BB%A1%E8%B6%B3%E6%9D%A1%E4%BB%B6f%282%29%3D0%2C%E6%96%B9%E7%A8%8Bf%28x%29%3Dx%E6%9C%89%E7%AD%89%E6%A0%B9.%281%29%E6%B1%82f%28x%29%E7%9A%84%E8%A7%A3%E6%9E%90%E5%BC%8F%282%29%E9%97%AE%E6%98%AF%E5%90%A6%E5%AD%98%E5%9C%A8%E5%AE%9E%E6%95%B0m%2Cn%28m%EF%BC%9Cn%29%2C%E4%BD%BFf%28x%29%E7%9A%84%E5%AE%9A%E4%B9%89%E5%9F%9F%E5%92%8C%E5%80%BC%E5%9F%9F%E5%88%86%E5%88%AB%E4%B8%BA%5Bm%2Cn%5D%E5%92%8C%5B2m%2C2n%5D%3F%E5%A6%82%E5%AD%98%E5%9C%A8%2C%E5%86%99%E5%87%BAm%2Cn%E7%9A%84%E5%80%BC.%E5%A6%82%E4%B8%8D%E5%AD%98%E5%9C%A8.)
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