${\displaystyle \underset{0}{\overset{1}{\int }}\left(1+3x\right)f^{\prime }\left(x\right)\text{d}x}=2019$ ; $4f\left(1\right)-f\left(0\right)=2020$ Tính ${\displaystyle \underset{0}{\overset{\frac{1}{3}}{\int }}f\left(3x\right)\text{d}x}$

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