Category: 18级数师
200516-函数的概念-06180543
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200529-等差数列前n项和-22170814
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200612-等差数列前n项和说课-06180550
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200515-函数的奇偶性1-06180535
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200515函数奇偶性0618516
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200529-等差数列前n项和-06180531
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