Mathematics
Senior High
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数列です
線引いてあるところの式の変形がどうなってるのかが分かりません
(4k³-1)=4k³-21
k=1
k=1
k=1
=4112m(n+1)-2
-n= =n{n(n+1)²-1}
= n(n³+2n2+n-1)
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