2004/2005*2006 用简便方法计算,

问题描述:

2004/2005*2006 用简便方法计算,

2004/2005 ×2006
=2004/2005 ×(2005 + 1)
= 2004/2005 ×2005 + 2004/2005×1
= 2004 + 2004/2005
= 2004又 2004/2005