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旋转文本
Author:
GeoGebra Institute of WuXi
GeoGebra
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折扣
平行線的斜率
直線的斜率：水平變化 & 鉛垂變化
多邊形的面積
第八周作业3
Discover Resources
Euler line 2
疊代
mooc第五讲作业单晨制作
母子性質-1（動畫）
v型咖啡濾網
Discover Topics
Standard Deviation
Boxplot
Similar Triangles
Parallelogram
Secant Line or Secant