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Author:
dhc987
GeoGebra
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兩組對邊相等的四邊形
四邊形的特性
異分母分數減法
兩位數加法
判斷球體
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整數的加法
體積的量度 5
Copy of 圖一
勒洛三角形繞行動畫操作步驟
时钟（序列文本）
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Cube
Trigonometric Functions
Parallelogram
Exponent
Parabola