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三角形三边关系
Author:
许春兰
GeoGebra
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画直线等分三角形的面积
球体的体积推导（优化版）
兩位數加法
異分母分數減法
兩組對邊相等和有直角的四邊形
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七巧板奔人2
test
多位數乘法 三位數(max)與兩位數(max)相乘
Hamid Naderi Yeganeh segment4
limit of function f(x)=x^2
Discover Topics
Special Points
Translation
Probability
Tangent Line or Tangent
Indefinite Integral