已知边长为2的等边△ABC,O为△ABC的重心.有
=
(
+
),
=
(
+
),
=
(
+
),由A
1,B
1,C
1三点构成一个新的△A
1B
1C
1,面积记为S
1;
=
(
+
),
=
(
+
),
=
(
+
),再由A
2,B
2,C
2三点构成一个新的△A
2B
2C
2,面积记为S
2;
=
(
+
),
=
(
+
),
=
(
+
),再由A
3,B
3,C
3三点构成一个新的△A
3B
3C
3,面积记为S
3.按照上述规则依次作下去,作得第n个三角形为△A
nB
nC
n,面积记为S
n.
(1)求证:数列{S
n}为等比数列;
(2)令T
n=-S
nlog
4,求S=T
1+T
2+T
3+…+T
n的和值.