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正弦定理2
Author:
杨欣霞
GeoGebra
New Resources
三位數除以一位數（二）
兩位數除以一位數（一）
柱體建築師
錐體建築師
球體建築師
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座標
三角形外心
平面区域的理解
含有任意量词与存在量词的最值问题
拋物線代數性質,光學性質
Discover Topics
Median Value
Vectors 3D (Three-Dimensional)
Real Numbers
Secant Line or Secant
Tangent Line or Tangent