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zhengming
Author:
江卫军
GeoGebra
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画直线等分三角形的面积
【案例】圆柱体内放置一个大球六个小球
兩位數除以一位數（二）
讀磅
祖冲之的期望：内棋与外棋
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複合棒形圖: 圖一
奈格爾點
乘法表的自动练习的副本
閱讀量杯
S3 Ex4.3 Q01(3D圖)
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Planes
Tree Diagrams
Vectors
Arithmetic
Geometric Mean