Ta có :
\(m.A=\frac{m^{2009}+m}{m^{2009}+1}=\frac{m^{2009}+1+\left(m-1\right)}{m^{2009}+1}=1+\frac{m-1}{m^{2009}+1}\)
\(m.B=\frac{m^{2010}+m}{m^{2010}+1}=\frac{m^{2010}+1+\left(m-1\right)}{m^{2010}+1}=1+\frac{m-1}{m^{2010}+1}\)
Vì m2009+1 < m2010+1 => m.A > m.B => A > B
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