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根據百分率找數量（一）: 例4 的複本
Author:
Miss Tsang
,
GeoGebra Institute of Hong Kong
GeoGebra
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兩組對邊相等和有直角的四邊形
找出對稱軸
拼砌四邊形
美國國旗 (Claude 版)
判斷球體
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All you need is
等積的正六邊形與正方形
可控九九乘法口诀表
operations of matrix 2rd ver
圆内弦（迭代）
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Rational Numbers
Dilation
Vectors
Sine
Piecewise Functions