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正20面體展開
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GeoGebra
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兩位數加法
【案例】2018年全国1卷理科12题
算柱 (兩位數)
GeoGebra笔记功能体验课件
判斷球體
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函數
正方形面積
三线八角
扇形柱(調整底面圓的分割數，柱高)
S0G5平均不等式（无字证明）
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