Đặt A = \(\frac{10^{20}+1}{10^{21}+1}\)
=> 10A = \(\frac{10^{21}+10}{10^{21}+1}=1+\frac{9}{10^{21}+1}\)
Đặt B = \(\frac{10^{21}+1}{10^{22}+1}\)
=> 10B = \(\frac{10^{22}+10}{10^{22}+1}=1+\frac{9}{10^{22}+1}\)
Vì \(\frac{9}{10^{21}+1}>\frac{9}{10^{22}+1}\)
=> \(1+\frac{9}{10^{21}+1}>1+\frac{9}{10^{22}+1}\)
=> 10A > 10B
=> A > B