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正5角錐
Author:
張丰耘
GeoGebra
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兩位數加法
球体的体积推导（优化版）
四邊形的特性
畫出對稱圖形
【案例】圆柱体内放置一个大球六个小球
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面外一點
面積與積分值
P4構作對稱圖形
放缩尺
三角形重心的变化2.许兴华数学
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Symmetry
Logarithm
Linear Regression
Tree Diagrams
LCM and GCD