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算幾不等式
Author:
顏銓志 ycj
GeoGebra
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【案例】2018年全国1卷理科12题
兩位數加法
直角坐標平面上的旋轉變換
兩組對邊相等和有直角的四邊形
兩位數除以一位數（二）
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圓的展開partII
餘弦定理的圖形證明
Solving Triangles (Ambiguous SSA case)
圆的面积原理
Completing the Square (Part 3)
Discover Topics
Fractal Geometry
Algebra
Statistics
Quadratic Functions
Trigonometry