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三垂線
Author:
Wu Xiao-Ren
GeoGebra
New Resources
找出對稱軸
三位數除以一位數（二）
拼砌四邊形
兩組對邊相等的四邊形
四邉形 (四年級) 教師版
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Homework8
[問題] a² + b² = 1, (c-4)² + (d-2)² = 5，求 ad - bc 最大值？
Pythagorean Theorem Proof with Shearing
較複雜的周界問題(二)
小六 平均數 (供教師講解用)
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Kite
Mode
Equations
Area
Quadratic Functions