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正四面體空間中投影
Author:
鍾元杰
拉動A,B可以將正四面體在空間中旋轉。
GeoGebra
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近似值：有效數字
四邊形的特性
兩組對邊相等的四邊形
Nested spiral octagon
長方體平面投影 (Codex版)
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畢達哥拉斯定理
判斷線型函數y=f(x)=ax+b的b值(隨機出題)
平方差
三角形中線定理求最小值
数学中考分区试题
勒洛四面体（参数曲面法）
Discover Topics
Upper and Lower Sum or Riemann Sum
Logic
Hypergeometric Distribution
Multiplication
Arithmetic Operations