Mathematics
Senior High
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(2) 初項が3,公比が-12128÷3=-1212 の等比数列である
から, 求める和は
3{1-(---)"} 3/1
(2)
1
= 2(1-(-²22-₁) = 2 + (-2) ₁-²
=2{1-
}
(-2)n−1
(-2)n
3
2
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![(2)[1]の式はなぜこうなるのでしょうか？
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