这样想:1=1+(1/2-1/2)+(1/3-1/3)+(1/4-1/4)……… 重新组合 =(1-1/2)+(1/2-1/3)+1/4+(1/3-1/4) =1/2+1/6+1/4+1/12
1/ (2 )+1/( 4)+1/(6 )+1/(12 )=1祝你开心
1/ (2 )+1/( 2+2)+1/(2+2+2)+1/(12 )=1