A = 2002 . 2002
A = ( 2000 + 2 ) . 2002
A = 2000 . 2002 + 2 . 2002
B = 2000 . 2004
B = 2000 . ( 2002 + 2 )
B = 2000 . 2002 + 2000 . 2
Vì 2 . 2002 > 2000 . 2
=> A > B
Ta có : \(A=2002.2002=2002.\left(2000+2\right)=2002.2000+2002.2\)
\(B=2000.2004=2000.\left(2002+2\right)=2000.2002+2000.2\)
Ta thấy : \(2002.2000=2000.2002\)
\(2002.2>2000.2\)
\(\Rightarrow\) \(A>B\)