Mathematics
Senior High
この後どーやって綺麗にまとめればいいか教えてください！
Sn = 6an+ 3n
6
anti
-3= (an-3)
On -3: [a-3) ー|
Ca,-3)点か1
Si=Qi= 6a.+31
一50に3 0, = -
Cn 33 -5.
の-1
5
3(5
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