随便出题，多少都行。比小学六年级的课本难的题，写上答案。
热心网友
(1):求值:1/1×2+1/2×3+1/3×4+1/4×5+.......1/2005×2006=?解:∵1/1×2=1/1-1/2 1/2×3 =1/2-1/3 1/3×4=1/3-1/4...........1/2004×2005=1/2004-1/2005 1/2005×2006=1/2005-1/2006∴原式=1/1-1/2 +1/2-1/3+1/3-1/4+.....+1/2004-1/2005+1/2005-1/2006=1-1/2006=2005/2006.