Mathematics
Senior High
Resolved
この式変形が分かりません。
[舞][答]
n
n
n
n
(1) Σk (k²+1) = Σ (k³+k)= Σ k³+ Σk
Σk(x²+1)=(x²+k)=Σk²+Σk
1
= {n(n+1)})² + n (n+1)= n(n+1){n(n+1)+2} n(n+
= n(n+1)(n²+n+2)
2
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2段目から分からなかったのですが、画像で理解出来ました!!