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错觉：挤出一块小空间
Author:
acchu
GeoGebra
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兩組對邊相等和有直角的四邊形
拼砌四邊形
算柱 (兩位數)
【案例】2018年全国1卷理科12题
三位數除以一位數（二）
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平移
ptccs2new
基础知识
网易
比一比看谁大
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Solids or 3D Shapes
Equilateral Triangles
Quadrilaterals
Similar Triangles
Statistics