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CK106
Author:
arist
GeoGebra
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球體建築師
三位數除以一位數（二）
畫出對稱圖形
sanjiaohanshu
四邊形的特性
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二元一次不等式-約東條件下的極大值極小值
合 24（淺中深）
第二次:20190110
賺賠：例3的副本
验证勾股定理
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Tangent Function
Right Triangles
Reflection
Tangent Line or Tangent
Parallelogram