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平行四边形变形
Author:
dhc987
GeoGebra
New Resources
球体的体积推导（优化版）
兩組對邊相等和有直角的四邊形
找出對稱軸
球體建築師
四邉形 (四年級) 教師版
Discover Resources
線性變換
橢圓規
指對數函數交點_2
梯形的面積
Addition and Subtraction of Directed Numbers (2)
Discover Topics
Trigonometric Functions
Mode
Differential Calculus
Set Theory
Optimization Problems