a)\(B=2022.2022\)
\(=\left(2021+1\right)2022\)
\(=2021.2022+2022\)
Vì \(2020< 2022\Rightarrow2021.2020< 2021.2022\Rightarrow2021.2020< 2021.2022+2022\)
hay \(A< B\)
b)\(M=360.345-200\)
\(=360\left(344+1\right)-200\)
\(=360.344+360-200\)
\(=360.344+160< 340.344+161=N\)
\(\Rightarrow M< N\)