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TRIANGLE
Author:
Tina Lin
GeoGebra
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異分母分數減法
GeoGebra笔记功能体验课件
四邊形的特性
四邉形 (四年級) 教師版
錐體建築師
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樞紐問題
圖E
九九乘法表的認識
滚动的石头
椭球面
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Right Triangles
Difference and Slope
Numbers
Combinatorics
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