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矩形折叠（翻折问题）
Author:
浅蓝色
GeoGebra
New Resources
中华人民共和国国旗
盈利與虧蝕
龙形曲线-分形龙
撒针估算面积实验
龙形曲线-分形龙2
Discover Resources
Triangular Number 三角形數
模擬3D空間物件：空間坐標軸的建立
Bearings
正五角柱展開
ttyy
Discover Topics
Histogram
Parallelogram
Quadratic Functions
Numbers
Planes