设{a(n+1)+dan}成等比,令公比为q,则a(n+1)+dan=q[an+da(n-1)],得到an+1=(q-d)an+qda(n-1).又由已知得到an+1=an+6an-1,因此q+(-d)=1,q(-d)=-6,因此q,-d分别是x^2+x-6=0的两根,-d=3或-2,即d=-3或2.
(1/2)已知数列an满足a1=a2=5,an+1=an+6an-1(n大于等于2,n属于N*) 求出所有使数列{a(n
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