Mathematics
Senior High
Solved
k3乗の時のくくり方が分からないので教えて欲しいです
節末問題
1 次の和を求めよ。
n
Z
(1) k(k+1)(k+2)
k=1
その姿を求め
ΣK(k+D(k+2) k+3k+2k
(c=1
3
=>
{in (n+1)} ² + 3 • #^ ( n + (2n+1) +2.5
2
fn (n+1) {{Bn (n+1)} } +3 (2n+1)+6}
&n (n+1) (an² + 18 n³ + 9n² + 6n+3+6)
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貼りますね