9 2 + 1 + 3+ +- 5 + 6 - 3 1 1 11 1 12 + + + 2 + + + 2 = 1- 2 +...
2
- 9
2
+ 1
+ 3
+
+
- 5
+ 6
- 3
2 -
1 1 1
1
1
1
2 + +
+ 2 +
+ + 2
= 1
- 2 + 2006
2
0
2
ˆ
0
ˆ ˆ
++
+
+
= 0
2
22
2
- 9
2
+ 1
+ 3
+
+
- 5
+ 6
- 3
2 -
1 1 1
1
1
1
2 + +
+ 2 +
+ + 2
= 1
- 2 + 2006
2
0
2
ˆ
0
ˆ ˆ
++
+
+
= 0
2
22