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Author:
知己
GeoGebra
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比較五件物件的重量
折扣
小学资源收集
第三周作业效果演示
科赫雪花
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讀磅
reflectional symmetry_4
內外角平分線的副本
圓周公式應用題2的副本
勾股定理证明演示--分割股边
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Subtraction
Trapezoid
Line Segment
Cone
Straight Lines