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30度直角三角形
Author:
郭勇
GeoGebra
New Resources
算柱 (兩位數)
找出對稱軸
四邉形 (四年級) 教師版
異分母分數減法
球体的体积推导（优化版）
Discover Resources
平行與角度
[問題] x² + 2xy + y² + 5x + ay + b > 0
空間中的平面
組織圖、頻數多邊形
正四角錐
Discover Topics
Exponent
Congruence
Sequences and Series
Logarithm
Random Variables