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素数表
Author:
zhen chen
GeoGebra
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異分母分數減法
柱體建築師
球体的体积推导
三位數除以一位數（一）
四邊形的特性
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代數運算：外心座標
tetrahedron rotational symmetric
US Unemployment 200701~201707
多位數乘法 三位數(max)與兩位數(max)相乘
反比例函数的图像与性质
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Exponential Functions
Triangles
Solids or 3D Shapes
Volume
Geometric Transformations