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三角形的高與面積
Author:
+x sir
GeoGebra
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【案例】2018年全国1卷理科12题
畫出對稱圖形
三位數除以一位數（一）
第八周作业
兩位數除以一位數（一）
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Symetry
範例：自製工具「格線」
Quiz on Interior & Exterior Angles of Triangles 三角形內角和及外角：測驗
正四角錐
周界
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Inequalities
Matrices
Multiplication
Addition
Reflection