Question

SO SÁNH:

A = \(\frac{2021^{2021}+1}{2021^{2022}+1}\)và B = \(\frac{2021^{2022}-1}{2021^{2023}-1}\)

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Answer 1

Ta có:

\(A=\frac{2021^{2021}+1}{2021^{2022}+1}\Leftrightarrow10A=\frac{2021^{2022}+10}{2021^{2022}+1}=1+\frac{9}{2021^{2022}+1}\)

\(B=\frac{2021^{2022}-1}{2021^{2023}-1}\Leftrightarrow10B=\frac{2021^{2023}-10}{2021^{2023}-1}=1-\frac{9}{2021^{2023}-1}\)

Hay ta đang so sánh: \(\frac{9}{2021^{2022}};\frac{9}{2021^{2023}}\)

Mà \(\frac{9}{2021^{2022}}>\frac{9}{2021^{2023}}\)nên \(\frac{2021^{2021}+1}{2021^{2022}+1}>\frac{2021^{2022}-1}{2021^{2023}-1}\)hay\(A>B\)

Vậy \(A>B\)

Answer 2

Cảm ơn bạn Nguyễn Đăng Nhân nha !!!