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正方形
Author:
Yip Chi Wai
Topic:
Square
GeoGebra
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球体的体积推导（优化版）
四邉形 (四年級) 教師版
判斷球體
兩組對邊相等的四邊形
畫出對稱圖形
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小学数学
弹簧变化
正弦定理验证
圓與切線
全等三角形
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Quadratic Functions
Standard Deviation
Integral Calculus
Step Functions
Angles