・この動画「

【基础概念】函数第九节：函数的周期性

」@bilibili.comと
　　↓↓↓一緒に視聴されています(Often Viewed With)：↓↓↓
・【基础概念】集合第二节：集合间的关系
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・【基础概念】函数第四节：解析式的求法
・【基础概念】函数第五节：值域初步
・【基础概念】直线与圆第二节：直线方程的五种形式

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