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三角形的高與面積
Author:
+x sir
GeoGebra
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找出對稱軸
拼砌四邊形
四邊形的特性
兩位數除以一位數（二）
判斷球體
Discover Resources
DSE
第一冊
棒形圖2
拋物線5--包絡線法
F4_Ch9.1 任意角的三角比
Discover Topics
Surface
Percentages
Tree Diagrams
Parallelogram
Planes