Category: 18级数师
200529-等差数列求和1-06180555
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200612-等差数列的前n项和说课-22170820
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200522-函数的概念-06180543
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200529-平方差公式-06180543
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200529-平方差公式-06180502
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200516-函数的概念-06180543
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