| 2005 |
| 1×2 |
| 2005 |
| 2×3 |
| 2005 |
| 3×4 |
| 2005 |
| 4×5 |
| 2005 |
| 2004×2005 |
=2005×（
| 1 |
| 1×2 |
| 1 |
| 2×3 |
| 1 |
| 3×4 |
| 1 |
| 4×5 |
| 1 |
| 2004×2005 |
=2005×[（1-
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 3 |
| 1 |
| 4 |
| 1 |
| 2004 |
| 1 |
| 2005 |
=2005×[1-
| 1 |
| 2005 |
=2005-2005×
| 1 |
| 2005 |
=2004．
2005/1×2+2005/2×3+2005/3×4+2005/4×5+…+2005/2004×2005=_．
| 2005 |
| 1×2 |
| 2005 |
| 2×3 |
| 2005 |
| 3×4 |
| 2005 |
| 4×5 |
| 2005 |
| 2004×2005 |
数学人气：582 ℃时间：2020-04-04 03:35:50
优质解答
=2005×（
=2005×[（1-
=2005×[1-
=2005-2005×
=2004．
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