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圓內接四邊形任務二：提示一
Author:
Stanley Mak
GeoGebra
New Resources
小数 的副本
Fibonacci Clock
美國國旗 (Codex 版)
Nested spiral octagon
兩組對邊相等和有直角的四邊形
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[問題] a² + b² = 1, (c-4)² + (d-2)² = 5，求 ad - bc 最大值？
長方體的切割(二)
周界
正六面體展開圖
異分母分數減法
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Isosceles Triangles
Terms
Trigonometry
Division
Special Points