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初中八年级奥数：面积与面积法
Author:
王俊辉
拖动A、B、C、D，改变四边形形状
GeoGebra
New Resources
兩位數加法
錐體建築師
找出對稱軸
兩組對邊相等的四邊形
畫出對稱圖形
Discover Resources
DSE
數位學習社
三角形分割
perimeter
直线过定点问题(1)
Discover Topics
Indefinite Integral
Solids or 3D Shapes
Probability
Triangles
Tree Diagrams