Mathematics
Senior High
予習していて全くわからないので説明教えてください！【2】と【3】です。
39
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 1
(1) 1, 5, 5², 5³, .....
((2)
3'9'27'81'
(3) 6, -12, 24, - 48,
1
1
2/
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