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Conditions for parallelograms(平行四邊形的判定條件)
Author:
chisunch1
GeoGebra
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直線的斜率
三位數除以一位數（一）
垂直線的斜率
探究三角形的全等條件
平行線的斜率
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底面為梯形的四角柱表面積
甜甜圈v5
cos(π/n)cos(2π/n)cos(3π/n) ... cos(nπ/n) = ?
畢氏定理 (勾股定理) <Pythagorean theorem>
我的第一个绘本
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Function Graph
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Indefinite Integral
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