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正弦定理
Author:
yuchengda
GeoGebra
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兩組對邊相等和有直角的四邊形
三位數除以一位數（二）
第八周作业
拼砌四邊形
直角坐標平面上的旋轉變換
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了解圓方程(0)
圖一
一組物件的幾分之幾（練習）
test02
植树问题
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Equations
Combinatorics
Hypergeometric Distribution
Probability
Algebra