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Ex (ASA)
Author:
Ricky Chan
GeoGebra
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兩組對邊相等的四邊形
三位數除以一位數（一）
找出對稱軸
画直线等分三角形的面积
【案例】圆柱体内放置一个大球六个小球
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小學數學科 HTML5 Applets
黎曼和
垂直3
第三冊2-2練習11
橢圓面積的計算
Discover Topics
Geometry
Scalene Triangles
Parabola
Linear Functions
Tangent Line or Tangent