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一元二次方程求根公式
Author:
梁航宇
GeoGebra
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畫出對稱圖形
四邉形 (四年級) 教師版
兩組對邊相等的四邊形
柱體建築師
兩位數除以一位數（二）
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面积与面积问题
等量公理
Slope of a St. Line (formula)
找找看三角形外接圓的圓心在哪？
Ex.1
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Logarithm
Function Graph
Complex Numbers
Differential Calculus
Ratios