Question

So sánh 2004.2007 và 2005.2006

Answer 1

\(2004.2007=2004.\left(2006+1\right)\)

\(=2004.2006+2004\)

\(2005.2006=\left(2004+1\right).2006\)

\(=2004.2006+2006\)

do   \(2004< 2006\)

nên    \(2004.2006+2004< 2004.2006+2006\)

hay     \(2004.2007< 2005.2006\)

Answer 2

2004 . 2007 = 2004 . ( 2006 + 1 ) = 2004 . 2006 + 2004

2005 . 2006 = ( 2004 + 1 ) . 2006 = 2004 . 2006 + 2006

Vì 20004 . 2006 + 2004 < 2004 . 2006 + 2006 nên 2004 . 2007 < 2005 . 2006

Vậy 2004 . 2007 < 2005 . 2006