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happy new year2
Author:
李春培
happy new year2
GeoGebra
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球体的体积推导
異分母分數減法
找出對稱軸
球体的体积推导（优化版）
兩組對邊相等和有直角的四邊形
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初三奥赛：圆的切割线问题
k-ko-
三角形面積
函数作图工具的副本
指数函数定积分的动态演示.许兴华数学
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Cube
Tree Diagrams
Kite
Conditional Probability
Rational Numbers