Ta có:
\(A=\frac{-2012}{4025}=\frac{-2012}{4025}.2=\frac{-4024}{4025}\)
\(B=\frac{-1999}{3997}=\frac{-1999}{3997}.2=\frac{-3998}{3997}\)
\(\frac{4024}{4025}< 1< \frac{3998}{3997}\Rightarrow\frac{4024}{4025}< \frac{3998}{3887}\Rightarrow\frac{-4024}{4025}>\frac{-3998}{3997}\)hay \(\frac{-2012}{4025}>\frac{-1999}{3997}\)
\(\Rightarrow A>B\)