Mathematics
Senior High
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なぜこうなりますか！！！
y=2
n
(3) Σ5=5n
k=1
n
54 (1) (与式)+
= 5. — — n ( n + 1) + An
= 1/12m15m
n-1
(2)与式)=6k
k=1
6.
n(5n+13)
2
=6•½ (n−1){(n−1)+1}
2
=3n(n-1)
n
(3) (4)=Σk²-4k+
(3)与式24k
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ありがとうございます！🙏🏻🥹