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reflectional symmetry_2
Author:
maths324324
GeoGebra
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畫出對稱圖形
四邉形 (四年級) 教師版
球體建築師
柱體建築師
兩位數除以一位數（一）
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proof 64 潘研
[問題] a² + b² = 1, (c-4)² + (d-2)² = 5，求 ad - bc 最大值？
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翹翹板
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Arithmetic
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