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illusion Shepard's Tables
Author:
acchu
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同分母分數減法50
割圓法求Pi
探究正方體的截面
同分母加法50
輪子轉動問題_求直徑和半徑
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研習講義
How to draw a square with ruler and compasses?
angle sum of triangle
镂空菱形六十面体
Book10-Unit7-拼出平行四邊形
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Fractions
Geometric Mean
Symmetry
Percentages
Polygons
