an+1=(n^2+n-3)an 怎么证是等差数列如题

an+1=(n^2+n-3)an 怎么证是等差数列如题 An+1=3XAn+2n+1 怎么算出An+1-An=3(An-An-1)+2 数列｛an},a1=1,an+1=2an-n^2+3n,求｛an｝. Sn=2an+(-1)n次方 怎么求an 已知数列{an}满足a1+3a2+(3^2)*a3+.+3^(n-1)*an=n/3.求{n/an}的前n项和n/an=n*3^n之后怎么用 错位相减？ 数列{an}中,a1=2,an+1=4an-3n+1,求证{an-n}是等比数列 4an中n为下标an+1中n+1为下标an-n中an的n为下标 设an=(1/n+1)+(1/n+2)+(1/n+3)+...+1/2n,则an+1-an等于? an-1/an=-2n求得通项公式：an=√（n^2+1)-n 怎么算?具体? 数列an满足a1=1/3,Sn=n(2n-1)an,求an 数列{an},a1=3,an*a(n+1)=(1/2)^n,求an 已知数列｛an｝中,a(n+1)=an+2^n,a1=3,求an an+1 ,n+1是下表 ,an+1=an^3 a1=2 ,求an 数列｛an｝满足a1=1,且an=an-1+3n-2,求an 在数列an中,a1=2 an+1=an+3n则an= 已知{an}满足a1=1.an=3*n+2An-1,求an 数列an,a1=2,an+1=4an-3n+1,求证an-n是等比数列怎么用字母构造？ 在数列an中,a1=2 .an+1=4an–3n+1 .求证an-n是等比数列怎么用字母构造来求？ an+1=an^2/(an^2+2an),怎么构造新数列解此题问题是a(n+1)=an^2/(an^2+2an)