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三角形重心
Author:
Cao Yiming
移动三角形的三个顶点，A，B，C
GeoGebra
New Resources
兩組對邊相等和有直角的四邊形
兩位數加法
算柱 (兩位數)
找出對稱軸
兩組對邊相等的四邊形
Discover Resources
ppppp
面積與公式
小數（小四下）
test
Testing 20170308
五形面體 序
Discover Topics
Prism
Piecewise Functions
Matrices
Division
Trigonometric Functions