1⼀2×4+1⼀4×6+1⼀6×8+...+1⼀2008×2010 求专家解答!谢谢

2024-12-29 10:38:58
推荐回答(1个)
回答1:

=1/4(1/1×2+1/2×3+1/3×4+……+1/1004×1005)
=1/4×(1-1/2+1/2-1/3+……+1/1004-1/1005)
=1/4×(1-1/1005)
=251/1005