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撒针估算面积实验
Author:
孟宝兴
GeoGebra
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四邉形 (四年級) 教師版
錐體建築師
兩位數除以一位數（一）
【案例】2013年安徽高考15题
算柱 (兩位數)
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test2fhms
DSE Circle-ACT02A Relationship Between Angles and Centre and Circumference
Test
圖解直式開方
基础知识
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Surface
Derivative
LCM and GCD
Symmetry
Angles