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Addition facts to 20
作者：
Tammy Listner
主題：
加法
GeoGebra
最新資源
Tangent Vector (2)
apec
Slope Between 2 Points (Phase 2)
Which Quadrilateral is Which?
Vertical and Oblique Asymptote
探索資源
Problem Set 4-4-11
Switzerland (dynamic) by DE
Ellipse Reflection - Adjustable
Place Value Disks
Folium of Descartes
探索主題
算術
旋轉
黎曼和（Riemann Sum）
作圖
線段