= 0 = 2= - 2 = 2= 4 = 023233 7'2 4+ = 2( - 1) + = 21 2 1 2...
2 -
= 0
= 2
= - 2
= 2
= 2 - 4
= 0
2
3
3
7
'
2
4
+
= 2( - 1)
+
= 2 - 2
1
2
1
2
=
- 3
2
= 2 - 6
1 2
1
2
5
15
15
2
4
=
4
15
5
4
4
1
1
2
2
1
S u t m: OÀN TI N TRUNG - THCS Hoàng V n Th - N
2010
+
=
+
=
= 1
1
1
1
+
=
+
+ + +
+
+
+ + +
- 1
+ 1
+ 2
+1
-
:
+ 1
+ 3
- 4
- 1
- 1