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Author:
李春培
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兩組對邊相等的四邊形
四邊形的特性
異分母分數減法
兩位數加法
GeoGebra笔记功能体验课件
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有人要告白嗎?
駐波
Copy of sin(x) 的函數圖形
诱导公式五（90°+α）
華容道Klotski Puzzle-三橫二豎(考生版)
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Continuity
Cosine
Boxplot
Rotation
Linear Programming or Linear Optimization