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餘弦的定理
Author:
NG Chun Yee
GeoGebra
New Resources
兩位數除以一位數（一）
找出對稱軸
畫出對稱圖形
三位數除以一位數（二）
【案例】圆柱体内放置一个大球六个小球
Discover Resources
vector addition and subtraction
阿基米德雙胞胎圓
第三冊2-2練習11
數軸
畫三角形 題1b 的複本
Discover Topics
Numbers
Orthocenter
Sequences and Series
Rectangle
Arithmetic Operations