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撒针估算面积实验
Author:
孟宝兴
GeoGebra
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四邊形的特性
三位數除以一位數（一）
判斷球體
【案例】2018年全国1卷理科12题
算柱 (兩位數)
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橢圓規
尋找等腰三角形 Isosceles Triangle Hunt
同心圓
積分的副本
文繞圖1
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Trigonometry
Algebra
Terms
Means
Quadratic Functions