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餘弦定理
Author:
yuchengda
GeoGebra
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錐體建築師
異分母分數減法
拼砌四邊形
算柱 (兩位數)
【案例】2013年安徽高考15题
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數字棋盤
立體圖形 KH
二次函數（第四階段）
時間
二分法优化版（视频教程见https://www.bilibili.com/video/BV1ST4y1F78g）
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Random Experiments
Normal Distribution
Statistics
Planes
Cuboid