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圆在底面滚动动画
Author:
赵林
GeoGebra
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四邉形 (四年級) 教師版
判斷球體
三位數除以一位數（一）
異分母分數減法
拼砌四邊形
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題 3
圓切三半圓
Gaussian Heptagon construction
根據百分率找數量（一）:例1的副本
比較五件物件的重量
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Parabola
Subtraction
Rectangle
Geometric Transformations
Secant Line or Secant