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橢圓軌跡_過圓內一點與圓內切
Author:
Wu Xiao-Ren
GeoGebra
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異分母分數減法
三位數除以一位數（二）
兩組對邊相等和有直角的四邊形
找出對稱軸
四邊形的特性
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滾動的圓
Copy of 固定面積的圖形的周界變化
褶正三角形
賺賠：例1的副本
谢庆GGB绘本一
Discover Topics
Constructions
Quadratic Equations
Vectors
Geometric Transformations
Arithmetic Mean