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球表面积的一种特殊推导
Author:
孟宝兴
GeoGebra
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直線的斜率
多邊形的面積
祖冲之的期望：内棋与外棋
垂直線的斜率
空间中两直线的位置关系
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quadrilaterals 4
Quiz on Indices and Logarithms 指數和對數：測驗
Copy of 愛心
变化的三角形的垂心.许兴华数学
多普勒3D
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Subtraction
Prism
Cosine
Standard Deviation
Sine