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RECTANGLE
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GeoGebra
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拼砌四邊形
柱體建築師
直角坐標平面上的旋轉變換
兩組對邊相等和有直角的四邊形
兩位數加法
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以電子學習照顧數學科學習差異
[問題] a² + b² = 1, (c-4)² + (d-2)² = 5，求 ad - bc 最大值？
分蛋糕
More about Function
連連看！橢圓在哪裡？
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Intersection
Line Segment
Vectors
Difference and Slope
Symmetry