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Author:
Renxiaoli
GeoGebra
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祖冲之的期望：内棋与外棋
兩位數除以一位數（二）
多邊形的面積
垂直線的斜率
第八周作业
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優良作品1(沛綺)
Lituus
題2
弓形的滚动
杨辉三角
Discover Topics
Arithmetic
Sine
Matrices
Line Segment
Sphere