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莫比乌斯带
Author:
高数大狮
GeoGebra
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【案例】2013年安徽高考15题
兩位數加法
兩位數除以一位數（一）
第八周作业
兩組對邊相等和有直角的四邊形
Discover Resources
conjugate
數線(小數的認識)
start and end clock face
圓柱切割
錯角---垂直平行綫
Discover Topics
Similarity Transformation or Similarity
Tree Diagrams
Geometric Mean
Intersection
Means