因为an=sn-s(n-1)=3a(n+1)-3an 所以a(n+1)=4/3 an{1,4/3,16/9,......}an=(4/3)的n-1次幂n=1 ,a1=1/4(a1+1)²,得到a1=1s(n-1)=sn-an1/4[a(n-1)+1]²=1/4(an+1)²-an[a(n-1)+1]²=(an+1)...
急!高一数学:1.数列{an}中,Sn是其前n项和,若a1=1,a(n+1)=1/3Sn(n≥1)则an=?
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