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旋转的花瓣
Author:
孟宝兴
GeoGebra
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異分母分數減法
四邊形的特性
拼砌四邊形
球體建築師
兩組對邊相等的四邊形
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根據百分率找數量（一）: 例4
軌跡觀察---兩圓上線段中點
三角形的心的副本
線的面化
平面直角坐标系的构成
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Logarithmic Functions
Right Triangles
Trapezoid
Subtraction
Diagrams