题目内容
计算:(
+
+
+…+
)(
+1).
| 1 | ||||
|
| 1 | ||||
|
| 1 | ||||
|
| 1 | ||||
|
| 2005 |
原式=(
-1+
-
+
-
+…+
-
)(
+1)
=(
-1)(
+1)
=2005-1
=2004.
| 2 |
| 3 |
| 2 |
| 4 |
| 3 |
| 2005 |
| 2004 |
| 2005 |
=(
| 2005 |
| 2005 |
=2005-1
=2004.
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