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错觉：挤出一块小空间
Author:
acchu
GeoGebra
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四邊形的特性
異分母分數減法
兩組對邊相等的四邊形
拼砌四邊形
第八周作业
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chap. 1 by ck
分段移動
圓柱體與長方形的關係
gjzbh 矩陣與遞迴關係（3階）
二倍角的正切公式的证明
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Complex Numbers
Diagrams
Hypothesis Testing
Parabola
Equilateral Triangles