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
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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