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序列（圆内弦）
Author:
dhc987
GeoGebra
New Resources
AI 訓練教室
第八周作业
拼砌四邊形
近似值：有效數字
長方體平面投影 (Codex版)
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八年级数学竞赛之比例线段
路徑四動畫
正四面體對邊向量垂直作圖證明
congruent (SSA, RHS)
畫鐘面的副本
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Similarity Transformation or Similarity
Linear Programming or Linear Optimization
Mathematics
Geometry
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