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七巧板
Author:
Cathyyu920311
GeoGebra
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小数 的副本
異分母分數減法
兩位數加法
兩組對邊相等的四邊形
GeoGebra笔记功能体验课件
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電子幾何條（2014）
[問題] a² + b² = 1, (c-4)² + (d-2)² = 5，求 ad - bc 最大值？
Addition and Subtraction of Polynomials 1(多項式的加減法 1)
六邊形
鹿梅 初中数学几何课件（模型）
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Perimeter
Scatter Plot
Fractal Geometry
Trigonometric Functions
Secant Line or Secant