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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
拼砌四邊形
畫出對稱圖形
三位數除以一位數（一）
算柱 (兩位數)
Discover Resources
Trisectin the cube into 3 pyramids
Properties of Inequalities 不等式的加法與乘法性質
折線運動1
正十二面體內接正四面體或內接正六面體
擲兩個硬幣的機率分布的副本
Discover Topics
Addition
Pythagoras or Pythagorean Theorem
Similarity Transformation or Similarity
Numbers
Line Segment