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Author:
吴广艳
GeoGebra
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近似值：有效數字
拼砌四邊形
【案例】2018年全国1卷理科12题
找出對稱軸
異分母分數減法
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waaachen
一元一次不等式圖形
gjzbh 矩陣與遞迴關係（3階）
畢氏定理
对角线交点
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Inequalities
Quadrilaterals
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Arithmetic Mean