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lchsb
GeoGebra
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四邊形的特性
第八周作业
球體建築師
拼砌四邊形
兩組對邊相等的四邊形
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角椎體積
GeoGebra培训手册素材
橢圓教學_2016
六年級_正方體截面
正n凸多邊形旋轉對稱/反射對稱
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Cube
Surface
Congruence
Differential Calculus
Histogram