有理数 |1/2-1|+|1/3-1/2|+|1/4-1/5|+|1/5-1/4|+~|1/2012-1/2011|

问题描述:

有理数 |1/2-1|+|1/3-1/2|+|1/4-1/5|+|1/5-1/4|+~|1/2012-1/2011|

|1/2-1|+|1/3-1/2|+|1/4-1/5|+|1/5-1/4|+~~~|1/2012-1/2011|
=1-1/2+1/2-1/3+1/3-1/4+1/4-1/5+~~~~+1/2011-1/2012
=1-1/2012
=2011/2012确定确定