19.設(shè)數(shù)列{an}前n的項(xiàng)和為 Sn.且其中m為常數(shù). (1)求證{an}是等比數(shù)列 (2)若數(shù)列{an}的公比滿足q=f(m)且.為等差數(shù)列.并求 查看更多

 

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設(shè)數(shù)列{an}前n的項(xiàng)和為Sn,且其中m為常數(shù),

(1)求證{an}是等比數(shù)列

(2)若數(shù)列{an}的公比滿足q=f(m)且為等差數(shù)列,并求{bn}.

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設(shè)數(shù)列{an}前n的項(xiàng)和為Sn,且(3-m)Sn+2man=m+3(n∈N*).其中m為常數(shù),m≠-3且m≠0
(1)求證:{an}是等比數(shù)列;
(2)若數(shù)列{an}的公比滿足q=f(m)且b1=a1=1,bn=
3
2
f(bn-1)
(n∈N*,n≥2),求證{
1
bn
}
為等差數(shù)列,并求bn

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設(shè)數(shù)列{an}前n的項(xiàng)和為 Sn,且(3-m)Sn+2man=m+3(n∈N*).其中m為常數(shù),m≠-3且m≠0
(1)求證:{an}是等比數(shù)列;
(2)若數(shù)列{an}的公比滿足q=f(m)且b1=a1,bn=
3
2
f(bn-1)(n∈N*,n≥2),求證{
1
bn
}
為等差數(shù)列,并求bn

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設(shè)數(shù)列{an}前n的項(xiàng)和為 Sn,且(3﹣m)Sn+2man=m+3(n∈N*).其中m為常數(shù),m≠﹣3且m≠0
(1)求證:{an}是等比數(shù)列;
(2)若數(shù)列{an}的公比滿足q=f(m)且為等差數(shù)列,并求bn

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設(shè)數(shù)列{an}前n的項(xiàng)和為 Sn,且(3-m)Sn+2man=m+3(n∈N*).其中m為常數(shù),m≠-3且m≠0
(1)求證:{an}是等比數(shù)列;
(2)若數(shù)列{an}的公比滿足q=f(m)且為等差數(shù)列,并求bn

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