\(A=\dfrac{-9}{10^{2022}}+\dfrac{-9}{10^{2021}}+\dfrac{-10}{10^{2021}}\)
\(B=\dfrac{-9}{10^{2021}}+\dfrac{-9}{10^{2022}}+\dfrac{-10}{10^{2022}}=\dfrac{-9}{10^{2022}}+\dfrac{-9}{10^{2021}}+\dfrac{-10}{10^{2022}}\)
Do \(10^{2022}>10^{2021}>0\) và \(-10< 0\)
\(\Rightarrow\dfrac{-10}{10^{2022}}>\dfrac{-10}{10^{2021}}\)
\(\Rightarrow\dfrac{-9}{10^{2021}}+\dfrac{-9}{10^{2022}}+\dfrac{-10}{10^{2022}}>\dfrac{-9}{10^{2021}}+\dfrac{-9}{10^{2022}}+\dfrac{-10}{10^{2021}}\)
\(\Rightarrow B>A\)
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