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多边形旋
Author:
赵林
GeoGebra
New Resources
兩位數除以一位數（一）
畫出對稱圖形
第八周作业
拼砌四邊形
異分母分數減法
Discover Resources
阿基米德(3,8,8)
面積2
仙后座找北極星 (底稿)
教材製作-兩圓位置關係
面積題 F
Discover Topics
Trigonometric Functions
Arithmetic
Subtraction
LCM and GCD
Percentages