\(M=\left(4x^2-4x+1\right)+\left(x+\dfrac{1}{4x}-1\right)+2020\)
\(M=\left(2x-1\right)^2+\dfrac{\left(2x-1\right)^2}{4x}+2020\ge2020\)
\(M_{min}=2020\) khi \(x=\dfrac{1}{2}\)
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