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Author:
chen mingchuan
GeoGebra
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拼砌四邊形
四邉形 (四年級) 教師版
画直线等分三角形的面积
【案例】2018年全国1卷理科12题
兩組對邊相等和有直角的四邊形
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正三角形
圆锥的体积推导
碎形
sinx & cscx
新课标例86 箱线图与百分位数
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Percentages
Incircle or Inscribed Circle
Bar Chart or Bar Graph
Symmetry
Similar Triangles