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5.1 函数的定义和使用
https://www.bilibili.com/video/BV1Ls411w7rx?p=69
https://www.bilibili.com/video/BV1Ls411w7rx?p=70
https://www.bilibili.com/video/BV1Ls411w7rx?p=71
5.2 函数的参数和变量
https://www.bilibili.com/video/BV1Ls411w7rx?p=72
https://www.bilibili.com/video/BV1Ls411w7rx?p=73
https://www.bilibili.com/video/BV1Ls411w7rx?p=74
https://www.bilibili.com/video/BV1Ls411w7rx?p=75