设函数f(x)是f1(x)=4x+1,f2(x)=x+2,f3(x)=-2x+4三个函数的最小值,则f(x)的最大值为
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![设函数f(x)是f1(x)=4x+1,f2(x)=x+2,f3(x)=-2x+4三个函数的最小值,则f(x)的最大值为](/uploads/image/z/1577348-44-8.jpg?t=%E8%AE%BE%E5%87%BD%E6%95%B0f%28x%EF%BC%89%E6%98%AFf1%28x%29%3D4x%2B1%2Cf2%28x%29%3Dx%2B2%2Cf3%28x%29%3D-2x%2B4%E4%B8%89%E4%B8%AA%E5%87%BD%E6%95%B0%E7%9A%84%E6%9C%80%E5%B0%8F%E5%80%BC%2C%E5%88%99f%28x%29%E7%9A%84%E6%9C%80%E5%A4%A7%E5%80%BC%E4%B8%BA)
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