Question

数学题1/3-1/2的绝对值+1/4-1/3的绝对值+1/5-1/4的绝对值+.1/10-1/9的绝对值

Answer 1

数学题1/3-1/2的绝对值+1/4-1/3的绝对值+1/5-1/4的绝对值+.1/10-1/9的绝对值

=1/2-1/3+1/3-1/4+1/4-1/5+.+1/9-1/10

=1/2-1/10

=4/10

=2/5