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sinα + sinβ > 0 ?
Author:
羅驥韡 (Pegasus Roe)
GeoGebra
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兩位數除以一位數（一）
異分母分數減法
兩組對邊相等和有直角的四邊形
【案例】圆柱体内放置一个大球六个小球
球體建築師
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題4
chuan-eBook
用圓作成的三角形
旋转的圆锥内接锥体.许兴华数学
黄金螺线与向日葵-朱老师
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Quadrilaterals
Ellipse
Constructions
Interest Calculation
Secant Line or Secant