Mathematics
Senior High
Solved
①から②の変形がいまいちわかりません。
教えてください🙏
(n+1)+(n+ 2)² +
1P+2P+
P 2n
(2)
Σ(n+k)p
k=1
2n
> kp
k=1
2n
>
k=1
+(2n)P
2n
Σ(1+
k=1
+(n+2n)Þ
k\ p 1
n
n
k\p
n
-
1
n
であり
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