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轨迹20
Author:
万超杰
GeoGebra
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三位數除以一位數（一）
兩組對邊相等和有直角的四邊形
錐體建築師
画直线等分三角形的面积
畫出對稱圖形
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折扣 例6
以剪貼比較圖形大小 題2
邊長與三角形 數學教室(1/4)
Circumference 圓周
二元线性规划的图解法(练习2)
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Quadrilaterals
Ellipse
Pie Chart or Circle Chart
Optimization Problems
Sphere