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元旦快乐（制作：孟宝兴）
Author:
孟宝兴
GeoGebra
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双心四边形
讀磅
比較五件物件的重量
直線的斜率：水平變化 & 鉛垂變化
空间中两直线的位置关系
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車輪車輪
題八
判斷球體 3
量詞
三棱锥的三视图的副本
Discover Topics
Reflection
Quadratic Equations
Addition
Rhombus
Logarithm