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luodeqin@keleshuxue.com
GeoGebra
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四邉形 (四年級) 教師版
兩位數除以一位數(二)
第八周作业
兩組對邊相等和有直角的四邊形
兩組對邊相等的四邊形
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計算在區域內部的圖形總數
異分母的分數加減
平行四邊形
IMO2015D
Addition and Subtraction of Polynomials 1(多項式的加減法 1)
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Step Functions
Coordinates
Rectangle
Centroid or Barycenter
Numbers