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圆内弦（迭代）
Author:
dhc987
GeoGebra
New Resources
画直线等分三角形的面积
兩組對邊相等的四邊形
算柱 (兩位數)
三位數除以一位數（二）
拼砌四邊形
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兩外切圓之外公切線作圖法
ie 9
圓錐曲線
雙曲線3-等軸法
雪花的碎形規律
Discover Topics
Fractions
Terms
Poisson Distribution
Addition
Vectors 3D (Three-Dimensional)