一等比数列,S3,S9,S6成等差数列当am ,as ,at,成等差数列时,求m+s+t

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一等比数列,S3,S9,S6成等差数列当am ,as ,at,成等差数列时,求m+s+t
一等比数列,S3,S9,S6成等差数列当am ,as ,at,成等差数列时,求m+s+t

一等比数列,S3,S9,S6成等差数列当am ,as ,at,成等差数列时,求m+s+t
an=a1*q^(n-1),Sn=a1(1-q^n)/(1-q)
2S9=S3+S6,2a1*(1-q^9)=a1(1-q^3)+a1(1-q^6)
2a1*q^9=a1*q^3+a1*q^6
2a10=a4+a7
m+s+t=21

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