Mathematics
Undergraduate
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次の等式が成り立つことを数学的帰納法で示す問題が分からないので解説お願いします！💦💦
n-1 n
(a₁ + a₂ + + an)²:
· + an)² = Σa² + 2 Σ Σ ajak
k=1
l=1 k=l+1
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