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椭圆的光学性质
Author:
孟宝兴
GeoGebra
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球体的体积推导
画直线等分三角形的面积
異分母分數減法
漂亮的摇摆曲线
兩位數除以一位數（一）
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拋物線
小青蛙
Tool4P
放缩尺
根據百分率找數量（二）: 例1的副本
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Angles
Similar Triangles
Calculus
Orthocenter
Rational Numbers