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专题4.2等差数列知识储备知识点一等差数列的概念思考1给出以下三个数列：(1)0,5,10,15,20.(2)4,4,4,4，….(3)18,15.5,13,10.5,8,5.5.它们有... 2025-06-30538307.31 KB10页296
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