已知数列{an}满足a1=1,an+a(n+1)=(1/3)的n次方(n∈N),Sn=a1+3a2+3²a3……+3n-1次方an,则4Sn-3的n次方×an=
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已知数列{an}满足a1=1,an+a(n+1)=(1/3)的n次方(n∈N),Sn=a1+3a2+3²a3……+3n-1次方an,则4Sn-3的n次方×an=已知数列{an}满足a1=1,
已知数列{an}满足a1=1,an+a(n+1)=(1/3)的n次方(n∈N),Sn=a1+3a2+3²a3……+3n-1次方an,则4Sn-3的n次方×an=
已知数列{an}满足a1=1,an+a(n+1)=(1/3)的n次方(n∈N),Sn=a1+3a2+3²a3……+3n-1次方an,
则4Sn-3的n次方×an=
已知数列{an}满足a1=1,an+a(n+1)=(1/3)的n次方(n∈N),Sn=a1+3a2+3²a3……+3n-1次方an,则4Sn-3的n次方×an=
答案是n,你把Sn写出来,把3Sn写出来,两式相加,把1式第一项和2式第一项相加,1式第二项和2式第三项相加,以此类推,每一项都是1,所以4Sn=n+(3n-1次方)*an,所以答案为n.
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