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proof 49 黃彥淇
Author:
郭亮偉
GeoGebra
New Resources
兩組對邊相等的四邊形
錐體建築師
異分母分數減法
三位數除以一位數（一）
拼砌四邊形
Discover Resources
中央極限定理
测试 = =
音調與空氣柱
Locus (Non parallel lines) _a
描点法绘制函数图象，以一次函数为例
Discover Topics
Rotation
Fractal Geometry
Natural Numbers
Ellipse
Vectors 3D (Three-Dimensional)