1/(2^3)+1/(2^3+1)+1/(2^3+2)+1/(2^3+3)+...+1/(2^4-1)
(1) 1,2,3( )
2(3+1)(3^2+1)(3^3+1)(3^4+1)(3^8+1)+1
“1”“2”“3”“4”
1+2+3×4
2 1 -2 -3
2+2+3+4+1
(1+1/2+1/3+...+1/2006)*(1/2+1/3+1/4+...1/2007)-(1+1/2+1/3+..
已知一组数:-1/1,1/2,-2/2,1/2,-1/3,2/3,-3/3,2/3,-1/3,1/4,-2/4,3/4,
1/3,2/3,1/3,1/4,2/4,3/4,2/4,1/4,( ),( ),( ),( ),( ),( ),( )
1;(1-1/2^2)(1-1/3^2)(1-1/4^2)````````````(1-1/99^2)(1-1/100^
奥数六年级1/2/(1+1/2)+1/3/(1+1/2)(1+1/3)+1/4/(1+1/2)(1+1/3)(1+1/4
1 2 4和1 2 3