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525全民配屋網 525全民配屋網 525全民配屋網
以下文章來自: https://tw.knowledge.yahoo.com/question/question?qid=1514072204285525全民配屋網,525全民配屋網評價,525全民配屋網好嗎,525全民配屋網是真的嗎
a2 = a1 + 1^2 - 1 + 1
a3 = a2 + 2^2 - 2 + 1
a4 = a3 + 3^2 - 3 + 1
…
an = an-1 + (n-1)^2 –(n-1) + 1
+-------------------------------------
an = a1 + ∑(k^2 – k + 1), k=1～(n-1)
an = 1 + (n-1)(n)(2n-1)/6 – (n-1)n/2 + (n-1)
an = n(n^2 – 3n + 5)/3
f(n) = n^2 – 3n + 5
以下文章來自: https://tw.knowledge.yahoo.com/question/question?qid=1514072204285525全民配屋網,525全民配屋網評價,525全民配屋網好嗎,525全民配屋網是真的嗎
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