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椭圆的离心率
Author:
孟宝兴
GeoGebra
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拼砌四邊形
四邊形的特性
球體建築師
異分母分數減法
四邉形 (四年級) 教師版
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生活中的平面圖形─角的性質
homework3
文星中学一模数学压轴题
線性變換矩陣（二階）的副本
根據百分率找數量（二）: 例4的副本
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Translation
Vectors
Vectors 2D (Two-Dimensional)
Constructions
Similarity Transformation or Similarity