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正九邊形
Author:
李春培
正九邊形
GeoGebra
New Resources
兩位數除以一位數（二）
異分母分數減法
三位數除以一位數（一）
第八周作业
判斷球體
Discover Resources
機率分布圖
Quiz on Projection of a Line Segment on a Plane 投影：測驗
gjc102a19 三角形的對折
Copy of 平行四邊形面積
中职数学
Discover Topics
Trigonometric Functions
Rational Numbers
Tree Diagrams
Cosine
Distributions