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鱼儿找食物
Author:
汪晓应
GeoGebra
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三位數除以一位數（二）
拼砌四邊形
球体的体积推导
兩組對邊相等和有直角的四邊形
【案例】2013年安徽高考15题
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畫三角形 題3c
半圓內切球內切圓
多邊形周界B
circle: line from centre
三角函數圖解的副本
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Probability
Diagrams
Perimeter
Stochastic Process or Random Process
Multiplication