题目

1/(1*3)+1/(3*5)+1/(5*7)+----1/(97*99)等于多少?

提问时间：2020-10-20

答案

1/(1*3)+1/(3*5)+1/(5*7)+----1/(97*99)
=1/2[1-1/3]+1/2[1/3-1/5]+...+1/2[1/97-1/99]
=1/2[1-1/3+1/3-1/5+...+1/97-1/99]
=1/2*[1-1/99]
=1/2*98/99
=49/99