【外接球 内切球 棱切球】很难做不出来~
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基础越差，提分越猛！
![Download Video: [高一春季8]内切球与外接球问题，牢记几个常用模型就可以](https://i2.hdslb.com/bfs/archive/ac7eef0de01f0ece8922be2d0e5c6174de9663a0.jpg@336w_190h_!web-video-rcmd-cover.webp)
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