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同旁內角---水平平行綫
Author:
chanfushun
GeoGebra
New Resources
漂亮的摇摆曲线
斜率的值
球体的体积推导
三位數除以一位數（一）
圓的切線方程
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等差數列等差數列
優良作品2(怡雯)
較複雜的周界問題(二)
蛇行腳踏車
兩條直線垂直應用
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Kite
Angles
Tree Diagrams
Translation
Ellipse