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Author:
Cheung Kun
GeoGebra
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四邉形 (四年級) 教師版
兩組對邊相等和有直角的四邊形
球体的体积推导（优化版）
球體建築師
【案例】圆柱体内放置一个大球六个小球
Discover Resources
三角形重心軌跡
行星運動
拋物線
特殊時鐘模擬
第六次:20190412
Discover Topics
Kite
Addition
Normal Distribution
Calculus
Circle