Question

观察算式,寻找规律算数 1-1/2= 1/2-1/3= 1/3-1/4= 算出得数,想一想,你发现了什么?

Answer 1

1-1/2= 1/2

1/2-1/3= 1/6

1/3-1/4=1/12

1/2+1/6+1/12+1/20

=1-1/2+1/2-1/3+1/3-1/4+1/4-1/5

=1-1/5

=4/5