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中華民國國旗
Author:
侯杰材
GeoGebra
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兩組對邊相等和有直角的四邊形
算柱 (兩位數)
兩位數加法
兩位數除以一位數（二）
画直线等分三角形的面积
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商高定理之正三角形1
立體圖形的旋轉對稱
請做出一正三角形
劉徽的「割圓術」的副本
operation of matrix
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Terms
Upper and Lower Sum or Riemann Sum
Secant Line or Secant
Pyramid
Interest Calculation