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9.4-1 平面与平面的位置关系
Author:
GeoGebra Institute of WuXi
GeoGebra
New Resources
兩位數加法
算柱 (兩位數)
兩組對邊相等的四邊形
判斷球體
兩位數除以一位數（二）
Discover Resources
Construct a regular pentagon
強森定理強森定理
蝴蝶線ggb
Locus (Non parallel lines)
畢氏三元數
Discover Topics
Matrices
Standard Deviation
Natural Numbers
Parallelogram
Geometric Mean