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chen mingchuan
GeoGebra
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拼砌四邊形
球体的体积推导(优化版)
兩位數除以一位數(一)
【案例】2013年安徽高考15题
兩位數加法
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塗色
Furstum
鉛筆的長度
廣義三角:sin, cos
描点法画三角函数图像-只改参变量
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Trigonometry
Cuboid
Polygons
Functions
Conic Sections