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證平行四邊形 (對邊相等)
Author:
W.L. Wong, Albert
GeoGebra
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四邉形 (四年級) 教師版
sanjiaohanshu
長方體平面投影 (Codex版)
算柱 (兩位數)
兩組對邊相等和有直角的四邊形
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三角型
Geogebra 教學
橢圓旋轉
大小不同串珠
拋物線5--包絡線法
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