题目内容
计算
+
+
+…+
=______.
1+
|
1+
|
1+
|
1+
|
原式=
+
+
+
+…+
,
=1+1-
+1+
-
+1+
-
+1+
-
…+1+
-
,
=2010+(1-
+
-
+
-…+
-
),
=2010+(1-
),
=2010
.
3 |
2 |
7 |
6 |
13 |
12 |
21 |
20 |
20102+2010+1 |
2010(2010+1) |
=1+1-
1 |
2 |
1 |
2 |
1 |
3 |
1 |
3 |
1 |
4 |
1 |
4 |
1 |
5 |
1 |
2010 |
1 |
2011 |
=2010+(1-
1 |
2 |
1 |
2 |
1 |
3 |
1 |
3 |
1 |
2010 |
1 |
2011 |
=2010+(1-
1 |
2011 |
=2010
2010 |
2011 |
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