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生活中的平面圖形─多邊形的性質
Author:
Galen_1
GeoGebra
New Resources
拼砌四邊形
找出對稱軸
三位數除以一位數（一）
四邉形 (四年級) 教師版
第八周作业
Discover Resources
Demo
Venn diagram
三角函數伸縮與平移
两角和的正切公式几何证明
奔马
Discover Topics
Upper and Lower Sum or Riemann Sum
Vectors
Conditional Probability
Mathematics
Diagrams