Mathematics
Senior High
Solved
数Bの和を求める問題です。
(4)の問題で、kの3乗を求めるのになぜ2乗をしているのかが分かりません。
わかる方教えてください🙏🙇♀️
35
Σ k²
2=1
(4) Σ k³
k = 1
35
(3) k²
k=1
24
(4) Σ k³
k=1
||
35(35+1)(2.35 +1) = 14910
12.24(24+1)=90000
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