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Author:
Ricky Chan
GeoGebra
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兩組對邊相等的四邊形
拼砌四邊形
兩位數除以一位數（二）
【案例】2018年全国1卷理科12题
兩組對邊相等和有直角的四邊形
Discover Resources
refraction law
優良作品4(薇如)
sequence-circle
Inclined plane (Angle between two planes)
F3 Ch9.3 羅盤方位角
Discover Topics
Standard Deviation
Differential Equation
Ellipse
Functions
Triangles