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a03~x² + y² / 9 + z² / 4 = 1
Author:
黃斌
GeoGebra
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拼砌四邊形
【案例】2013年安徽高考15题
兩組對邊相等的四邊形
兩位數加法
畫出對稱圖形
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軸對稱
三角形内角和，演示
下和
二面角
测试问题
Discover Topics
Variance
Integral Calculus
Division
Circle
Sequences and Series