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Author:
詠甯
GeoGebra
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兩組對邊相等的四邊形
拼砌四邊形
兩位數加法
【案例】2013年安徽高考15题
兩位數除以一位數（二）
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Circle on a Sphere
三角形3,4,5
DSE Circle-ACT03C Relationship Between Arcs and Angles at Circumference
軌跡觀察---三同心圓上的三角形重心軌跡
Copy of 銳角三角：sin, cos
Discover Topics
Arithmetic
Sine
Prism
Quadratic Functions
Logarithmic Functions