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分數加法
Author:
iedc
GeoGebra
New Resources
兩位數除以一位數(二)
異分母分數減法
兩位數除以一位數(一)
球体的体积推导(优化版)
球體建築師
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waaachen
路徑一動畫
[問題] a² + b² = 1, (c-4)² + (d-2)² = 5,求 ad - bc 最大值?
製作對稱圖形 LEVEL 1
拖拉小正方体
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Congruence
Vectors
Division
Angles
Piecewise Functions