Mathematics
Senior High
計算過程を細かく教えてほしいです🙇♀️🙇♀️
辺々を引くと
(1-x)S=1+3(x+x2+ +xn-1)
よって
S=-
*(1-x-¹)
1-x
1+2x-(3n+1)x" +(3n-2)x+1
=1+3.
- (3n-2)x"
-(3n-2)xn
1-x
1+2x- (3n+1)x"+(3n-2)xn+1
(1-x)2
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