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Author:
德旺 孙
GeoGebra
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平行線的判定
龙形曲线-分形龙2
活动三：应用性质
第八周作业2
正方形雪花图案
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二次函數圖形
Solving Triangles (SSA case) 解任意三角形(SSA情況)
Addition of 3 Directed Numbers
rotational symmetry_4
正弦定理的副本
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Rotation
Functions
LCM and GCD
Translation
Addition