Mathematics
Senior High
Resolved
【2】と【3】が全くわからないです。
途中式含めて詳しく説明教えてください！
19
次の等比数列の初項から第n項までの和を求めよ。
(1) 1, 5, 5², 5³,
1
1
((2)
(3) 6, -12, 24, -48,
3
9
F
1
27’ 81*
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