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Author:
李政憲
GeoGebra
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找出對稱軸
錐體建築師
三位數除以一位數（二）
異分母分數減法
兩組對邊相等和有直角的四邊形
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a>1, y=Log(a,x) and y=a^x 有可能0,1,2交點!?
數學傳播39卷4期, 平面幾何公式思考
百分數：折扣 / 賺賠
三角形的高
gjh-g03-01 和的平方公式的副本
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Fractal Geometry
Line Segment
Cone
Curve Sketching
Sphere