Mathematics
Senior High
ここの計算の仕方が分かりません！詳しく教えてくださいませんか？
(1-x)S=1+3 ( x + x² + ...
+xx-1)
-(3n-2)x"
=1+3.
x(1-x-1) +
- (3n-2)xn
1-x
1+2x (3n+1)x" +(3n-2)x^2+1
-
1-x
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