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勒洛四面体(请下载后用geogebra5打开)
Author:
赵林
GeoGebra
New Resources
垂直線的斜率
常见四边形是否是双心四边形
百分數及其應用
平行線的斜率
折扣
Discover Resources
y=x²-a的圖形
三角排列
Quiz on Signs of Coefficients of Quadratic Functions 二次函數係數的正負號：測驗
微元法演示
椭圆的光学性质