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sharon扭曲的正方形
Author:
杨秀芬
GeoGebra
New Resources
兩組對邊相等的四邊形
異分母分數減法
球體建築師
画直线等分三角形的面积
三位數除以一位數（一）
Discover Resources
自製工具：「星星」
Demo
Weighted Mean 加權平均數
seq,tra
滑轮组2
Discover Topics
Right Triangles
Function Graph
Angles
Circle
Area