1/1*2+1/2*3+1/3*4+1/4*5+.1/98*99+1/99*100=?
1/1×2+1/2×3+1/3×4+1/4×5+.+1/98×99+1/99×100=?
1/1*2+1/2*3+1/3*4+1/4*5+.1/98*99+1/99*100=?
1*2/1+2*3/1+3*4/1+.98*99/1+99*100/1=?
1/1*2*3*4+1/2*3*4*5+...+1/97*98*99*100=?
1+2+3+4+.99+100+99+98+97.+1
1+2+3+4+5+6+""""+98+99+100=?
1+2+3+4+5+6.+98+99+100=?
(1+1/1*3)*(1+1/2*4)*(1+1/3*5).(1+1/98*100)*(1+1/99*101)
(1+1/1+3)*(1+1/2*4)*(1+1/3*5)*.*(1+1/98*100)*(1+1/99*101)
1+2+3+4+.98+99=?
1/1*2+1/2*3+1/3*4~+1/98*99+1/99*100 *=乘以
1/(2*3)+1/(3*4)+1/(4*5)+...+1/(98*99)+1/(99*100)等于多少