已知是首项为1的等比数列，且成等差数列，则数列的前5项的和为 A

已知是首项为1的等比数列，且成等差数列，则数列的前5项

的和为

A．31 B．32 C． D．

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已知是首项为1的等比数列，且成等差数列，则数列的前5项 的和为 A

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已知是首项为1的等比数列，且成等差数列，则数列的前5项的和为 A