a1=20,an+1=an+2n-1.求an的通项公式都来看一下,挺不错的一道题
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1.a1=1,an+1=an+2n-1,求an 2.a1=1,an+1=2an+2n-1,求an 3.a1=1,an+1=3an+3n,求an4.a1=1,an+1=3an+6,求an就这4个,用累加或累乘的方法做
已知数列(an)满足a1=1.an+1=3an+2n-1,求an
1、在数列{an}中,a1=1.a(n+1)=3an+2n+1.求an.2、在数列{an}中,a1=-1,a(n+1)=(3an-4)/[(an)-1].求an.
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数列{an}满足a1=2,a(n+1)=2an+n+2,求an
数列an满足a1=1/3,Sn=n(2n-1)an,求an