题目内容
观察下列计算:
=
-1,
=
-
,
=
-
,
=
-
…从计算结果中找出规律,并利用这一规律计算:(
+
+
+…+
)(
+1)=______.
| 1 | ||||
|
| 2 |
| 1 | ||||
|
| 3 |
| 2 |
| 1 | ||||
|
| 4 |
| 3 |
| 1 | ||||
|
| 5 |
| 4 |
| 1 | ||||
|
| 1 | ||||
|
| 1 | ||||
|
| 1 | ||||
|
| 2008 |
原式=(
-1+
-
+
-
+…+
-
)(
+1)
=(
-1)(
+1)
=2008-1
=2007.
故答案为:2007.
| 2 |
| 3 |
| 2 |
| 4 |
| 3 |
| 2008 |
| 2007 |
| 2008 |
=(
| 2008 |
| 2008 |
=2008-1
=2007.
故答案为:2007.
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