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• sn,s2n-sn,s3n-s2n成等比q为多少

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• sn,s2n-sn,s3n-s2n成等差数列

• sn,s2n-sn,s3n-s2n成等比数列的公比

• sn,s2n-sn,s3n-s2n成等比数列公差为

• sn,s2n-sn,s3n-s2n成等差数列的公比

• sn,s2n-sn,s3n-s2n成等比数列公比为

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• sn,s2n-sn,s3n-s2n成等差

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