题目内容
2004×
| （
|
|
（1）2004×
=（2003+1）×
=2003×
+1×
=2002+
=2002
；
（2）（
+
）×15×17
=（
+
）×（15×17）
=
×15×17+
×17×15
=17+30
=47；
（3）
+
+
+…+
=1-
+
-
+
-
+…+
-
=1-
=
．
| 2002 |
| 2003 |
=（2003+1）×
| 2002 |
| 2003 |
=2003×
| 2002 |
| 2003 |
| 2002 |
| 2003 |
=2002+
| 2002 |
| 2003 |
=2002
| 2002 |
| 2003 |
（2）（
| 1 |
| 15 |
| 2 |
| 17 |
=（
| 1 |
| 15 |
| 2 |
| 17 |
=
| 1 |
| 15 |
| 2 |
| 17 |
=17+30
=47；
（3）
| 1 |
| 1×2 |
| 1 |
| 2×3 |
| 1 |
| 3×4 |
| 1 |
| 99×100 |
=1-
| 1 |
| 2 |
| 1 |
| 2 |
| 1 |
| 3 |
| 1 |
| 3 |
| 1 |
| 4 |
| 1 |
| 99 |
| 1 |
| 100 |
=1-
| 1 |
| 100 |
=
| 99 |
| 100 |
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