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Author:
王正豪
GeoGebra
New Resources
兩位數加法
兩組對邊相等和有直角的四邊形
画直线等分三角形的面积
第八周作业
判斷球體
Discover Resources
七巧板（tangram）
I am superman
例子
两平面夹角
斜率大小
Discover Topics
Reflection
Vectors
Trigonometric Functions
Unit Circle
Derivative