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求一數是另一數的幾分之幾（比較）
Author:
Tong Wing Hong
GeoGebra
New Resources
異分母分數減法
三位數除以一位數（二）
第八周作业
畫出對稱圖形
球体的体积推导（优化版）
Discover Resources
locus wrt two pts on two indep. circle
reflection of tetrahedron
螢橋國中-林安哲
橢圓規Ellipsograph (Trammel of Archimedes)
任意角的生成
Discover Topics
Arithmetic
Reflection
Ellipse
Hypothesis Testing
Confidence Interval