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三角形面積公式 1/2 bc sinA的副本
Author:
粤海 邓
,
羅驥韡 (Pegasus Roe)
GeoGebra
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兩組對邊相等和有直角的四邊形
【案例】2013年安徽高考15题
拼砌四邊形
球體建築師
兩位數除以一位數（一）
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Sum of First n Cubes 首n個立方數之和
分數與小數
Rolling Star
颜畅和完成的图像1
乘法训练
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Curve Sketching
Random Experiments
Quadrilaterals
Similar Triangles
Vectors