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面積：從梯形到三角形 02
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GeoGebra
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異分母分數減法
兩組對邊相等和有直角的四邊形
【案例】圆柱体内放置一个大球六个小球
畫出對稱圖形
拼砌四邊形
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將「文字」標示在長與寬
[問題] a² + b² = 1, (c-4)² + (d-2)² = 5，求 ad - bc 最大值？
gitfh 複合圖形-正四角柱中挖圓柱
十分逼近法及根號概念
三角形的重心
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Division
Median Line
Quadratic Functions
Expected Value
Algebra