已知数列{an}满足a1=2,且anan+1+an+1-2an=9(n∈N+).(1)求a2、a3、
来源:学生作业帮 编辑:搜搜做题作业网作业帮 分类:数学作业 时间:2024/08/08 06:44:32
已知数列{an}满足a1=2,且anan+1+an+1-2an=9(n∈N+).(1)求a2、a3、
![已知数列{an}满足a1=2,且anan+1+an+1-2an=9(n∈N+).(1)求a2、a3、](/uploads/image/z/16835149-37-9.jpg?t=%E5%B7%B2%E7%9F%A5%E6%95%B0%E5%88%97%7Ban%7D%E6%BB%A1%E8%B6%B3a1%3D2%2C%E4%B8%94anan%2B1%2Ban%2B1-2an%3D9%EF%BC%88n%E2%88%88N%2B%EF%BC%89%EF%BC%8E%EF%BC%881%EF%BC%89%E6%B1%82a2%E3%80%81a3%E3%80%81)
此题是否是这个样的呢:ana(n+1)+a(n+1)-2an=9
当n=1时,有:
a1*a2+a2-2*a1=9
2*a2+a2-4=9
3*a2=13
a2=13/3
当n=2时,有:
a2*a3+a3-2*a2=9
16/3*a3-26/3=9
16/3*a3=53/3
a3=53/16
当n=1时,有:
a1*a2+a2-2*a1=9
2*a2+a2-4=9
3*a2=13
a2=13/3
当n=2时,有:
a2*a3+a3-2*a2=9
16/3*a3-26/3=9
16/3*a3=53/3
a3=53/16
已知数列{an}满足:a1=1,且an-a(n-1)=2n.求a2,a3,a4.求数列{an}通项an
已知数列{an}满足a1=1,an+1=2an+1(n∈N*). 若函数bn=anan+1,求数列
已知数列{an}满足a1+a2+a3+...+an=n^2+2n.(1)求a1,a2,a3,a4
如果数列{an}满足a1=2,a2=1,且(an-1-an)/(anan-1)=(an-an+1)/(anan+1)(n
已知数列{an}满足:a1=1,且an-an-1=2n,求(1)a2,a3,a4.(2)求数列{an}的通项an
已知数列(an)满足a1=1,an+1=2an/an+2(n∈N*) 求a2,a3,a4,a5 猜想数列(an)的通项公
已知数列{an}满足a1=2且anan+1-2an=0球a2,a3,a4的值
已知数列{an}满足:a1=1,a2=a(a>0),数列{bn}满足:bn=anan+2(n∈N*)
已知数列(an)满足a1+2a2+3a3+...+nan=n(n+1)(n+2)求an
已知数列{an}满足a1=1,an=a1+1/2a2+1/3a3+...+1/n-1an-1(n>1)求数列{an}的通
已知数列an满足:a1+a2+a3+...+an=n-an,(n=1,2,3,...)第一问:求a1,a2,a3的值.第
已知数列{an}中满足a1=1,a(n+1)=2an+1 (n∈N*),证明a1/a2+a2/a3+…+an/a(n+1