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GeoGebra
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兩組對邊相等的四邊形
球體建築師
兩位數除以一位數（一）
第八周作业
画直线等分三角形的面积
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平行線的性質
How to draw a hexagon with ruler and compasses?
S.3 ch7 area and volume 3
例题1
雪櫃裏的食物
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Trigonometric Functions
Congruence
Square
Constructions
Geometric Distribution