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长方形周长展开
Author:
liujunyang0812
GeoGebra
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【案例】2013年安徽高考15题
球体的体积推导
判斷球體
拼砌四邊形
球體建築師
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waaachen
公切線的條數
三角函數的精確值
S6 3D Trigonometry HKDSE Past Paper
四角柱體（長方體）的截面
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Vectors 2D (Two-Dimensional)
Fractal Geometry
Multiplication
Real Numbers
Angles