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椭圆的定义
Author:
guomenglin
Topic:
Ellipse
GeoGebra
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三位數除以一位數（二）
直角坐標平面上的旋轉變換
兩位數加法
四邉形 (四年級) 教師版
拼砌四邊形
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為甚麼二次函數中，a是正數，開口向上?
Decimal
Apollonius Problem 5 CPP Inversion
Magic Matches
Copy of 平行四邊形的面積教材一
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Trigonometry
Optimization Problems
LCM and GCD
Limits
Complex Numbers