已知数列{a n }满足a 1 =1,a 2 =3,a n+2 =3a n+1 -2a n (n∈N + )
1个回答
1)略
(2)
是以
为首项,2为公比的等比数列。
(2)由(1)得
相关问题
已知数列{a [n]}满足a[1]=1 a[n]=a[1]+2a[2]+3a[3]+……+(n-1)a[n-1](n>=
已知数列{a n }满足: 1 a 1 + 1 a 2 + 1 a 3 +…+ 1 a n =n 2 (n≥1,n∈N
已知数列{a n }中a 1 = 3 5 ,a n =2- 1 a n-1 (n≥2,n∈N*),数列{b n },满足
已知数列{a n }满足 a 1 = 5 2 ,2a n+1 =3a n -1.
已知数列{an}满足a1=1,a2=3,a(n+1)=4an-3a(n-1)(n属于N*,n>=2)
1.已知数列{a(n)}满足a(n)a(n+1)a(n+2)a(n+3)=24,且a1=1 a2=2 a3=3则a1+a
已知数列{a n }满足a n+1 =-a n 2 +2a n (n∈N * ),且0<a 1 <1.
已知数列{a n }满足a 1 =1,且a n =2a n-1 +2 n (≥2,且n∈N * )
已知数列{an}满足a1=1,an=a1 1/2a2 1/3a3 … 1/(n-1)a(n-1),(n>1,n∈N ),
已知数列{a n }满足a 1 = 1 11 , a n+1 = a n 1-2 a n (n∈N * ).