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仙后座找北極星
Author:
陳建銘
GeoGebra
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盈利與虧蝕
圓周公式的應用
直線的斜率：水平變化 & 鉛垂變化
祖冲之的期望：内棋与外棋
探究三角形的全等條件
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三個外切圓
小学数学
[問題] 橢圓與雙曲線有共同焦點
Effects on Dispersion
ETV 對稱
Discover Topics
Numbers
Median Value
Fractions
Equilateral Triangles
Normal Distribution