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光在角内反射
Author:
海平 文
Topic:
Reflection
GeoGebra
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球体的体积推导（优化版）
祖冲之的期望：内棋与外棋
探究三角形的全等條件
球体的体积推导
多邊形的面積
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Clock24hour
拋物線
纏繞
作業1:內心
yuanmianjituidao
Discover Topics
Ellipse
Step Functions
Cylinder
Multiplication
Cosine