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固定三角形的條件−題1
Author:
Anthony OR 柯志明
Topic:
Congruence
,
Triangles
GeoGebra
柯志明 香港教育局
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錐體建築師
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三位數除以一位數（二）
sanjiaohanshu
球體建築師
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內心
圓的平移
GGB8
Mathematics and Optics (and their applications)
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