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二面角
Author:
qianqianhouhou
二面角的概念，拖动A、E点改变半平面
GeoGebra
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球體建築師
GeoGebra笔记功能体验课件
第八周作业
柱體建築師
【案例】2018年全国1卷理科12题
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I am superman
trigonometry1
反演
两角和的余弦公式几何证明
有趣的线
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Multiplication
Frequency Distribution
Triangles
Square
Definite Integral