数列满足A1=1,A2=3.并且An+2-4An+1+4An=0.1、证明{An+1-2An}是等比数列(此题不用证明了) 2、令Bn=An/(2^n),求数列{Bn}的前n项和.
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数列满足A1=1,A2=3.并且An+2-4An+1+4An=0.1、证明{An+1-2An}是等比数列(此题不用证明了)2、令Bn=An/(2^n),求数列{Bn}的前n项和.数列满足A1=1,A2
数列满足A1=1,A2=3.并且An+2-4An+1+4An=0.1、证明{An+1-2An}是等比数列(此题不用证明了) 2、令Bn=An/(2^n),求数列{Bn}的前n项和.
数列满足A1=1,A2=3.并且An+2-4An+1+4An=0.
1、证明{An+1-2An}是等比数列(此题不用证明了)
2、令Bn=An/(2^n),求数列{Bn}的前n项和.
数列满足A1=1,A2=3.并且An+2-4An+1+4An=0.1、证明{An+1-2An}是等比数列(此题不用证明了) 2、令Bn=An/(2^n),求数列{Bn}的前n项和.
An=3^(n-1)……应该没错吧
Bn=3^(n-1)/(2^n)……不又是个等比数列了吗?
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