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陳兪宏
阿凱老師的幾何問題
GeoGebra
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四邊形的特性
GeoGebra笔记功能体验课件
柱體建築師
兩位數加法
兩組對邊相等的四邊形
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偏導數、切平面、梯度
几何体
sinα + sinβ > 0 ?
函数积分
testing book
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Diagrams
Root
Linear Functions
Scalene Triangles
Algebra