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乘方快练
Author:
孙逸旻
GeoGebra
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畫出對稱圖形
画直线等分三角形的面积
兩組對邊相等和有直角的四邊形
判斷球體
三位數除以一位數（一）
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乘法公式2
整數加減向量示意
simson line
不規則鑲嵌無背景 楊靜宜
艾薛爾Escher
Discover Topics
Geometric Transformations
Right Triangles
Inequalities
Trapezoid
Kite