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二面角
Author:
肖建伟
二面角
GeoGebra
New Resources
畫出對稱圖形
【案例】圆柱体内放置一个大球六个小球
異分母分數減法
判斷球體
四邊形的特性
Discover Resources
ibooks-函數的平移
Expansion & Factorization 展開與因式分解
行星軌跡
S0G5平均不等式（无字证明）
小学一年级上（人教版）
Discover Topics
Kite
Arithmetic Mean
Function Graph
Triangles
Frequency Distribution