Mathematics
Senior High
Solved
数学のシグマの和の問題です。途中式を教えてください。
n-1
72
(2) (3k²-7k+4) (3) (k³+k)
(3) (k³+k) (4) Σ2k
k=1
n(n-1)²
k=1
k=1
(n+1)(n+n+2)
n (n-1)
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