Mathematics
Senior High

数学B 数列の和の問題です。
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次の和を求めよ。 12 (1) Σ(5k+4) k=1 (3) Σk(k+3) (4) 3² +6² +9² +··· + (3n)² (2) (4k³-1) k=1 108OTFOOX B (5) 12.2+2.3+3.4+…+n(n+1)

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