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mooc第四讲椭圆反射
Author:
单晨
GeoGebra
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兩組對邊相等和有直角的四邊形
第八周作业
四邉形 (四年級) 教師版
兩位數除以一位數（一）
判斷球體
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找出活動所用的時間
三角形的高
求公切線段長
S3 Ex4.3 Q03(3D圖)
星形线-Astroid Curve-with-Envelope Command
Discover Topics
Sine
Centroid or Barycenter
Mathematics
Geometry
Cosine