Mathematics
Senior High
数Bのシグマの問題です。
(8)教えてください🙇♀️
12
(8) Σ(2k-1)²
k=1
12
= 2 (4k²-4k+1)
K<=1
12
= 42k ²4²²k + Z
K-1
k=1
k=1
= 4√ £X/2² (1271) x (20/2+1)
4×22×12×(12+1)+12
1/12×13×25-24×13+12
325
312+12
2.
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