Mathematics
Undergraduate
次の等式を数学的帰納法で示す問題ですが全然分かりません💦丁寧に教えて下さると助かります！
n
n-1 n
.
(a₁ + a₂ + ··· + an)² = Σa² + 2[[
k=1
l=1 k=l+1
a jak
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