|1/4-1/2|【左右括号为绝对值符号】+|1/6-1/4|+|1/8-1/6|+.+|1/2010-1/2008|,
=1/2-1/4+1/4-1/6+1/6-1/8+……+1/2008-1/2010
=1/2-1/2010
=1004/2010
=502/1005
|1/4-1/2|【左右括号为绝对值符号】+|1/6-1/4|+|1/8-1/6|+.+|1/2010-1/2008|,
=1/2-1/4+1/4-1/6+1/6-1/8+……+1/2008-1/2010
=1/2-1/2010
=1004/2010
=502/1005