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Author:
项剑文
GeoGebra
New Resources
第八周作业
兩組對邊相等的四邊形
兩位數除以一位數（二）
兩組對邊相等和有直角的四邊形
算柱 (兩位數)
Discover Resources
isosceles triangle construction
旋轉動畫
摺紙1
circle
二次函數a的意義
Discover Topics
Right Triangles
Linear Programming or Linear Optimization
Arithmetic
Complex Numbers
Step Functions