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ie 7
Author:
LAM YU SANG
GeoGebra
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画直线等分三角形的面积
兩位數除以一位數（二）
四邉形 (四年級) 教師版
球體建築師
兩組對邊相等和有直角的四邊形
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平行綫的斜率
test021
煞車
三角函數伸縮與平移
球体的截面
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Logic
Trapezoid
Interest Calculation
Rhombus
Geometry