|1/2009-1/2008|+|1/2008-1/2007|+……+|1/3-1/2|+|1/2-1|=?
问题描述:
|1/2009-1/2008|+|1/2008-1/2007|+……+|1/3-1/2|+|1/2-1|=?
RT、要有过程和答案.
在6点之前回答的有追加.
答
|1/2009-1/2008|+|1/2008-1/2007|+……+|1/3-1/2|+|1/2-1|
=1/2008-1/2009+1/2007-1/2008+……+1/2-1/3+1-1/2
=1-1/2009
=2008/2009