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四下：多边形密铺验证
Author:
钟秀群
,
孟宝兴
GeoGebra
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JLA Harry Potter
Daddy Long-Legs
JLA Portrait
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JLA Copy of Eri Chan
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מצב הדדי בין מרכז מעגל חסום במשולש למרכז מעגל חוסם משולש
pythag 8.6
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Complex Numbers
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