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Author:
侯孟宏
GeoGebra
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拼砌四邊形
畫出對稱圖形
算柱 (兩位數)
兩位數加法
【案例】2018年全国1卷理科12题
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小学数学
正弦定理
P54_3d
平行線(方格版)
翰林數學_2下_CH3-4_三角形的外角大於任一內對角
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Division
Polygons
Trapezoid
Vectors 3D (Three-Dimensional)
Statistics