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正十二面體內接正四面體或內接正六面體
Author:
侯杰材
GeoGebra
New Resources
畫出對稱圖形
柱體建築師
兩位數加法
兩位數除以一位數(二)
四邉形 (四年級) 教師版
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Orthocentre
gjh-e01-04 未知數角度的三角形
拋物線與光線反射
三節棍
直线与圆、圆与圆的位置关系
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Equations
Arithmetic Operations
Integral Calculus
Ratios
Congruence