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三角形的构成的副本
Author:
vzchv
,
孟宝兴
GeoGebra
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兩組對邊相等和有直角的四邊形
四邉形 (四年級) 教師版
【案例】2018年全国1卷理科12题
找出對稱軸
三位數除以一位數（一）
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外心
圓點線
假分數轉為帶分數
zentangle
GeoGebra 检测教程
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Curve Sketching
Stochastic Process or Random Process
Trigonometric Functions
Combinatorics
Translation