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翰林數學_2下_CH4-3_梯形中線性質
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翰林數學
GeoGebra
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四邊形的特性
兩組對邊相等的四邊形
GeoGebra笔记功能体验课件
第八周作业
球體建築師
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畫方格
二次曲線的準線與焦點
正四角錐兩側面夾角
圖形拼砌
橢圓2--四圓心近似法
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Polygons
Perimeter
Constructions
Mode
Combinatorics