化简：|1/3-1/2|+|1/4-1/3|+|1/4-1/5|+...+|1/10-1/9|

化简：|1/3-1/2|+|1/4-1/3|+|1/4-1/5|+...+|1/10-1/9|
化简：|1/3-1/2|+|1/4-1/3|+|1/4-1/5|+...+|1/10-1/9|

化简：|1/3-1/2|+|1/4-1/3|+|1/4-1/5|+...+|1/10-1/9|
绝对值里面的都是负数,就交换一下位置
=1/2-1/3+1/3-1/4+1/4-1/5.+1/9-1/10
=1/2-1/10
=2/5