已知数列{An}满足A1=33.,An+1-An=2n,则An/n的最小值是

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已知数列{An}满足A1=33.,An+1-An=2n,则An/n的最小值是
已知数列{An}满足A1=33.,An+1-An=2n,则An/n的最小值是

已知数列{An}满足A1=33.,An+1-An=2n,则An/n的最小值是
an＝(an－a(n－1))＋(a(n－1)－a(n－2))＋……＋(a2－a1)＋a1＝n^2－n＋33
an/n＝n－1＋33/n,因为n为整数,故n应为5或6,当n＝5时,an/n＝53/5,当n＝6时,an/n＝21/2,故最小值为21/2.

题目错了吧

An=n^2-n+33
n=6时最小

An+1是不是A(n+1)啊?

An+1-An=2n 叠加得an-a1=n(n-1) 得an=n(n-1)+33 再除以n就行了～

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