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try(7) 用外積判定轉向和phase的正負
Author:
WC
GeoGebra
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兩位數除以一位數（二）
四邉形 (四年級) 教師版
拼砌四邊形
【案例】2013年安徽高考15题
判斷球體
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三角函數 Cos X 函數圖形
一元二次不等式(2)
DSE Circle-ACT04 Cyclic Quadrilaterals
五形面體 序
線性規劃
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Arithmetic
Line Segment
Circle
Upper and Lower Sum or Riemann Sum
Triangles