Category: 21级数学研究生第一次授课
211009-等差数列前n项和-212021084
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20211010-线段垂直平分线的性质-212021116
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http://m.youku.com/v_show/id_XNTgxMjE1NTczNg==.html
211009-弧度制-212040014
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211230-等差数列的前n项和-212021126
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211010-任意角的三角函数-212021094
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211009-等比数列前n项和-212040012
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211230-三角函数的概念-212021100
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211009-函数的概念-212021090
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211010-三角函数的概念-212021100
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