mik nhầm biểu thức B=20122013+1/20122012+1
Ta thấy:
\(2012^{2012}< 2012^{2013}\\ \Rightarrow2012^{2012}+1< 2012^{2013}+1\)
\(\Rightarrow A=\dfrac{2012^{2012}+1}{2012^{2013}+1}< \dfrac{2012^{2013}+1}{2012^{2013}+1}< \dfrac{2012^{2013}+1}{2012^{2012}+1}=B\)
Vậy A<B