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固定周界的長方形的面積變化（周界是200厘米）
Author:
李寶玲
,
GeoGebra Institute of Hong Kong
GeoGebra
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【案例】圆柱体内放置一个大球六个小球
空间中两直线的位置关系
双心四边形
漂亮的摇摆曲线
圓的切線方程
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winter vacation homework 8
兩條數線比較(雙單位)
棒形圖(我最喜愛的科目)
內積
Addition and Subtraction of Polynomials 2 (多項式的加減法2)
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Similar Triangles
Interest Calculation
Ratios
Tangent Line or Tangent
Linear Regression