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等差数列习题不一定非要考等差中项，掌握其性质才能以不变应万变
本部分的内容是为打卡易错题1000题的视频版；希望对大家有帮助；本节讲述了：等差数列中的习题不一定非要考等差中项，掌握其性质才能以不变应万变@石轩述数学 @头条内容付费
高三数学一轮复习错题没人讲解，可看这里，解决你没搞明白的问题287/893
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