Mathematics
Senior High
Solved
ここの変形が分からないです
n k=1
OM
=
n
n k=1
n
n
t² +
k=1
+
k
n+1
1
(n+1)²
k²
(−21² + 1) +
12-t+
1
n n+1
n
(−2t²+1)Σk+
1
1
3
t² -t+
Σ k²
k=1
n (n+1)²
4
k=1
Answers
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