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線性變換矩陣（二階）的副本
Author:
xiaodandan
,
arist
GeoGebra
New Resources
画直线等分三角形的面积
四邉形 (四年級) 教師版
兩組對邊相等和有直角的四邊形
球体的体积推导（优化版）
柱體建築師
Discover Resources
因數的判別
多边形对角线
幂函数的图像
乘法计时训练
椭圆的离心率
Discover Topics
Vectors
Boxplot
Vectors 2D (Two-Dimensional)
Rectangle
Quadrilaterals