Mathematics
Senior High
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+
1
(6) 立......
1
1
1
(7)
+
+
1.2.3 2.3.4
3.4.5
(8)Sn=1+2x+ 3 x 2 + 4 x 3 +
2+4x3+
3 + .....
(7)
(9) S
=
12
n 1 2
+
3-4
-
4
8
+
5
+
16
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