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外凸的正方形
Author:
宋晓燕
GeoGebra
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兩組對邊相等和有直角的四邊形
兩位數除以一位數（一）
【案例】2013年安徽高考15题
錐體建築師
畫出對稱圖形
Discover Resources
初中八年级奥数：面积与面积法
找中點軌跡
tetrahedron_refection
座標1
定积分求几何体体积 Definite Integral
Discover Topics
Quadrilaterals
Sphere
Unit Circle
Conic Sections
Differential Equation