19.设数列{an}前n的项和为 Sn.且其中m为常数. (1)求证{an}是等比数列 (2)若数列{an}的公比满足q=f(m)且.为等差数列.并求 查看更多

 

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设数列{an}前n的项和为Sn,且其中m为常数,

(1)求证{an}是等比数列

(2)若数列{an}的公比满足q=f(m)且为等差数列,并求{bn}.

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设数列{an}前n的项和为Sn,且(3-m)Sn+2man=m+3(n∈N*).其中m为常数,m≠-3且m≠0
(1)求证:{an}是等比数列;
(2)若数列{an}的公比满足q=f(m)且b1=a1=1,bn=
3
2
f(bn-1)
(n∈N*,n≥2),求证{
1
bn
}
为等差数列,并求bn

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设数列{an}前n的项和为 Sn,且(3-m)Sn+2man=m+3(n∈N*).其中m为常数,m≠-3且m≠0
(1)求证:{an}是等比数列;
(2)若数列{an}的公比满足q=f(m)且b1=a1bn=
3
2
f(bn-1)(n∈N*,n≥2),求证{
1
bn
}
为等差数列,并求bn

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设数列{an}前n的项和为 Sn,且(3﹣m)Sn+2man=m+3(n∈N*).其中m为常数,m≠﹣3且m≠0
(1)求证:{an}是等比数列;
(2)若数列{an}的公比满足q=f(m)且为等差数列,并求bn

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设数列{an}前n的项和为 Sn,且(3-m)Sn+2man=m+3(n∈N*).其中m为常数,m≠-3且m≠0
(1)求证:{an}是等比数列;
(2)若数列{an}的公比满足q=f(m)且为等差数列,并求bn

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