设{an} 为等差数列 , 且a2+a4-2a1=8.
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正确答案: 因为{an} 为等差数列,所以:
[img src="https://img.haodaxue.net/uploadimg/image/20200515/20200515174717_34344.png" alt="" />
[img src="https://img.haodaxue.net/uploadimg/image/20200515/20200515174749_27731.png" alt="" /> 答案分析:无
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