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andy122403
GeoGebra
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第八周作业3
正方形雪花图案
斐波那契螺旋弧线（表格法）
科赫雪花
双心四边形
Discover Resources
方格紙上畫正方形1
向量相加
面積
Doppler Effect and Shockwave
圆面积展开图--教学材料
Discover Topics
Right Triangles
Vectors
Angles
Trigonometric Functions
Numbers