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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
兩位數除以一位數（一）
三位數除以一位數（一）
画直线等分三角形的面积
柱體建築師
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volleyball throughing
生活
三節棍的軌跡
三角形内角和练习题课件
探究三角形的全等條件
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Median Line
Boxplot
Arithmetic Operations
Statistics
Random Variables