计算 |1/2011-1/2010|+|1/2010-1/2009|=+|1/2009-1/2008|+..+|1/2-1|= 计算 |1/2011-1/2010|+|1/2010-1/2009|=+|1/2009-1/2008|+..+|1/2-1|
问题描述:
计算 |1/2011-1/2010|+|1/2010-1/2009|=+|1/2009-1/2008|+..+|1/2-1|
=
计算 |1/2011-1/2010|+|1/2010-1/2009|=+|1/2009-1/2008|+..+|1/2-1|
答
绝对之内都是负数,去掉绝对值得(1/2010-1/2011)+1/2009-1/2010)....+1-2=-1/2011+1=1/2010
答
1/2010-1/2011+1/2009-1/2010+1/2008-1/2009+.........+1-1/2=-1/2011+1=2010/2011
答
首先考虑去绝对值符号,易看出每个绝对值里面是负数(以下去绝对值之后我改变了一下排序)
原式=1-1/2+1/2-1/3+1/3-1/4+……+1/2009- 1/2010+1/2010-1/2011
=1-1/2011
=2010/2011