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vertex of quadratic function
Author:
Felix Yip Wing Chung
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四邊形的特性
判斷球體
球體建築師
畫出對稱圖形
找出對稱軸
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四下_面積（一）(學生版)
優良作品2
坐标变换
三圓外切2
折正五邊形
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Prism
Function Graph
Tree Diagrams
Quadratic Functions
Planes