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23平行线周长正方形
Author:
万超杰
GeoGebra
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第八周作业
三位數除以一位數（一）
画直线等分三角形的面积
兩組對邊相等的四邊形
判斷球體
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平行四邊形有甚麼特性？
EnergyMath 2-3 棣美弗定理
三角形外心
sin函數
圆锥曲线
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Planes
Calculus
Subtraction
Complex Numbers
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