Question

已知S=[1+(-1/2)]+[1/2+(-1/3)]+[1/3+(-1/4)]+……+[1/2014+(-1/2015)] S的值为？

过程讲解下

Answer 1

S=1-(1/2)+(1/2)-(1/3)+(1/3)-(1/4)+……+(1/2014)-(1/2015)
=1-(1/2015)
=2014/2015

追问

过程打下行吧

追答

就是去括号 过程已经写了