1⼀2×1⼀3+1⼀3x1⼀4+1⼀4×1⼀5+

1/2×1/3+1/3×1/4+1/4×1/5+...+1/2001×2002+1/2002×2003
2024-11-17 22:22:26
推荐回答(1个)
回答1:

1/2×1/3+1/3×1/4+1/4×1/5+...+1/2001×2002+1/2002×2003
=(1/2-1/3+1/3-1/4+1/4-1/5+...+1/2001-1/2002+1/2002-1/2003
=1/2-1/2003
=2001/4006