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國旗
Author:
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GeoGebra
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拼砌四邊形
兩位數除以一位數（一）
兩組對邊相等和有直角的四邊形
四邊形的特性
【案例】2013年安徽高考15题
Discover Resources
task 1
亞瑟的圖像館
數學操作課程_20150920
同位角---不平行綫
禪繞畫2
Discover Topics
Indefinite Integral
Perimeter
Piecewise Functions
Ratios
Vectors 3D (Three-Dimensional)