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圆锥的侧面展开图3D动画
Author:
qianqianhouhou
拖动点C
GeoGebra
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找出對稱軸
拼砌四邊形
兩位數除以一位數（二）
兩位數加法
【案例】2013年安徽高考15题
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二次函数
坐标变换
n星角
V3-2-2
随机模拟实验（撒豆子估算π）的副本
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Matrices
Intersection
Rectangle
Calculus
Percentages