两千零九÷两千零九又两千零一十分之两千零九+两千零一十一分之一的简便算法!答对有赏分哦!

2009÷（2009又2009/2010）+1/2011
=2009÷(2009×（1+1/2010）)+1/2011
=1÷(2011/2010)+1/2011
=2010/2011+1/2011
=1