✨ Best Answer ✨
階差数列の初項は、b₁ = a₂ - a₁
これを変形すると、 a₂ = a₁ + b₁
そして、a₃ = a₂ + b₂ = (a₁ + b₁) + b₂ = a₁ + (b₁ + b₂）
これを繰り返すと、テキストのΣの式になります。
Mathematics
Senior High
Resolved
ここってなんで、n-1なんですか？
階差数列と一般項
数列 {an} の階差数列{bn} とすると
n≧2のとき
n-1
an=a1+26に
k=1
JA
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ありがとうございます🙏理解できました！