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内凹正方形对比
Author:
树常青
GeoGebra
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画直线等分三角形的面积
算柱 (兩位數)
兩位數加法
【案例】2018年全国1卷理科12题
兩位數除以一位數(一)
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軸對稱
幾何作業
設備設計
畢式定理(丞昀)
三角形數
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Means
General Quadrilateral
Histogram
Subtraction
Mathematics