Câu 36:
\(f\left(x\right)=x\cdot\ln x\)
=>\(f^{\prime}\left(x\right)=\left(x\right)^{\prime}\cdot\ln x+x\cdot\left(\ln x\right)^{\prime}=\ln x+x\cdot\frac{1}{x}=\ln x+1\)
\(P=f\left(x\right)-x\cdot f^{\prime}\left(x\right)+x+2022\)
\(=x\cdot\ln x-x\cdot\left(\ln x+1\right)+x+2022=2022\)
=>Chọn B
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