Ptt 大爆卦 | summation公式 - 前往 https://m.facebook.com/wonderfulmaths/posts/summation-notation-%E7%AC%AC%E4%B8%89%E5%9B%9E%E5%BE%88%E5%A4%9A%E4%BA%BA%E5%9C%A8%E9%AB%98%E4%B8%AD%E6%99%82%E9%83%BD%E8%AE%80%E9%81%8E%E4%BA%8C%E9%A0%85%E5%BC%8F%E5%AE%9A%E7%90%86%E4%BB%A5%E7%82%BA%E5%AE%83%E7%9A%84%E4%B8%BB%E8%A6%81%E7%94%A8%E9%80%94%E6%98%AF%E5%B1%95%E9%96%8B%E5%BC%8F%E5%AD%90%E6%B2%92%E6%9C%89%E4%BB%80%E9%BA%BC%E5%A4%AA%E5%A4%A7%E7%9A%84%E7%94%A8%E8%99%95%E5%A4%9A%E5%B9%B4%E4%BE%86%E6%88%91%E4%B9%9F%E4%B8%80%E7%9B%B4%E9%80%99%E6%A7%98%E4%BB%A5%E7%82%BA%E4%BD%86%E6%9C%80%E8%BF%91%E6%88%91%E5%8D%BB%E8%97%89%E8%91%97%E9%80%99%E5%80%8B%E5%AE%9A/957950580922439/

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並前往https://m.facebook.com/wonderfulmaths/posts/summation-notation-%E7%AC%AC%E4%B8%89%E5%9B%9E%E5%BE%88%E5%A4%9A%E4%BA%BA%E5%9C%A8%E9%AB%98%E4%B8%AD%E6%99%82%E9%83%BD%E8%AE%80%E9%81%8E%E4%BA%8C%E9%A0%85%E5%BC%8F%E5%AE%9A%E7%90%86%E4%BB%A5%E7%82%BA%E5%AE%83%E7%9A%84%E4%B8%BB%E8%A6%81%E7%94%A8%E9%80%94%E6%98%AF%E5%B1%95%E9%96%8B%E5%BC%8F%E5%AD%90%E6%B2%92%E6%9C%89%E4%BB%80%E9%BA%BC%E5%A4%AA%E5%A4%A7%E7%9A%84%E7%94%A8%E8%99%95%E5%A4%9A%E5%B9%B4%E4%BE%86%E6%88%91%E4%B9%9F%E4%B8%80%E7%9B%B4%E9%80%99%E6%A7%98%E4%BB%A5%E7%82%BA%E4%BD%86%E6%9C%80%E8%BF%91%E6%88%91%E5%8D%BB%E8%97%89%E8%91%97%E9%80%99%E5%80%8B%E5%AE%9A/957950580922439/

Σᵢ₌₁,...,ᵤ i = u(u+1)/2 他的證明令人嘆為觀止 - Facebook

Summation Notation 第三回很多人在高中時都讀過二項式定理，以為它的主要用途是 ... 之和的公式： Σᵢ₌₁,...,ᵤ i² = u(u+1)(2u+1)/6 Σᵢ₌₁,...,ᵤ i³ = [u(u+1)/2]² ...

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