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題一
Author:
GeoGebra Institute of Hong Kong
GeoGebra
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兩位數除以一位數（一）
拼砌四邊形
異分母分數減法
算柱 (兩位數)
【案例】圆柱体内放置一个大球六个小球
Discover Resources
垂心即內心
How to draw a triangle with ruler and compasses?
科展
銳角三角：sin, cos
初中数学模型
Discover Topics
Hyperbola
Hypothesis Testing
Orthocenter
Ratios
Rotation