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龍騰4_1-1課例1
Author:
廖傑成
GeoGebra
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兩組對邊相等的四邊形
拼砌四邊形
錐體建築師
兩位數加法
球体的体积推导（优化版）
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公因數應用題
第一冊
[問題] x² + 2xy + y² + 5x + ay + b > 0
Bayes' Thm
三角形外心的位置
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Congruence
Cuboid
Symmetry
Calculus
Trapezoid