(1+2+ 1/2)+(1+2+3+ 1/3)+.......+(1+2+3+.......+98+ 1/98)

着急是高手的就进 感激不尽

1/2-1/2=? (1+1/2)(1+1/2^2)(1+1/2^4)(1+1/2^8) (1-1/2^2)*(1-1/3^2)*(1-1/4^2).......(1-1/100^2) 1+1/(1+2)+1/(1+2+3)+...+1/(1+2+3+...+100) 1+1/(1+2)+1/(1+2+3)+-------+1/(1+2+3+----+100) 1+1/1+2+1/1+2+3+...+1/1+2+3...+2000 1+1/1+2+1/1+2+3.........+1/1+2+3.....100 1*(1/1+2)*(1/1+2+3)*~~~*(1/1+2+~~~2005)=? 3/2=2+1/1*2=1/1+1/2 1/1^2+1/2^2+...+1/n^2<2