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Mars Retrograde
Author:
Chenwei Chen
GeoGebra
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拼砌四邊形
異分母分數減法
【案例】2013年安徽高考15题
兩位數除以一位數（二）
球體建築師
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labyrinth
正弦定理的验证
二元一次不等式
畢氏定理
两角和的正弦公式几何证明1
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Functions
Linear Programming or Linear Optimization
Logic
Vectors
Multiplication