\(P=\left|x-2018\right|+\left|2020-x\right|+\left|x-2019\right|\)
\(P\ge\left|x-2018+2020-x\right|+\left|x-2019\right|=2+\left|x-2019\right|\ge2\)
\(\Rightarrow P_{min}=2\) khi \(x=2019\)
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