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直角三角形與正三角形
Author:
李春培
GeoGebra
New Resources
三位數除以一位數（二）
拼砌四邊形
兩位數除以一位數（二）
兩位數加法
第八周作业
Discover Resources
Percentage (Part-Whole) 所佔百分數
Conic section-ellipse&hyperbola
Pythagorean Theorem Proof with Shearing
平行四邊形的面積
Copy of 分數與小數
Discover Topics
Sequences and Series
Special Points
Correlation
Surface
Similarity Transformation or Similarity