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happy birthday
Author:
李春培
happy birthday
GeoGebra
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直線的斜率：水平變化 & 鉛垂變化
比較五件物件的重量
第三周作业效果演示
常见四边形是否是双心四边形
活动三：应用性质
Discover Resources
Polygon incised
ggb-fs-a1
zuiduan
Reflectionnn
二倍角的正弦公式的证明
Discover Topics
Solids or 3D Shapes
Poisson Distribution
Parallelogram
Rotation
Mode