Question

1/10-1/9的绝对值+1/9-1/8的绝对值+1/8-1/7的绝对值+...+1/3-1/2的绝对值+1/2-1的绝

Answer 1

1/10-1/9的绝对值+1/9-1/8的绝对值+1/8-1/7的绝对值+...+1/3-1/2的绝对值+1/2-1的绝对值

=1/9-1/10+1/8-1/9+1/7-1/8+.+1/2-1/3+1-1/2

=1-1/10

=9/10.