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矩形折叠（翻折问题）
Author:
浅蓝色
GeoGebra
New Resources
第三周作业效果演示
第八周作业3
第八周作业1
斐波那契螺旋弧线（表格法）
盈利與虧蝕
Discover Resources
商高定理4
Quiz on Mixed Arithmetic Operations of Positive Integers 正整數四則混合運算：測驗
範例二
线段
乘法練習
Discover Topics
Trigonometry
Prism
Subtraction
Statistical Characteristics
Equilateral Triangles