Question

记算记算；1/3减1/2的绝对值加1/4减1/3的绝对值,加1/5减1/4的绝对值,加,加1/10减1/9的绝对值.问题

Answer 1

|1/3-1/2|+|1/4-1/3|+|1/5-1/4|+……+|1/10-1/9|

=1/2-1/3+1/3-1/4+1/4-1/5……+1/9-1/10

=1/2-1/10

=4/10

=2/5