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waaachen
Author:
陳兪宏
廣義三角函數
GeoGebra
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四邉形 (四年級) 教師版
第八周作业
畫出對稱圖形
画直线等分三角形的面积
球体的体积推导
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相似三角形: 重溫
ggb-fs-a1
Quiz on Simplifying Monomials 化簡單項式：測驗
Multiplication of Polynomials(多項式的乘法)
k的几何意义
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Area
Median Line
Similarity Transformation or Similarity
Frequency Distribution
Reflection