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五上-CP4-第三节平行四边形面积1
Author:
冉献伟
GeoGebra
New Resources
第八周作业
異分母分數減法
球體建築師
球体的体积推导（优化版）
兩組對邊相等的四邊形
Discover Resources
對稱求最小
正三角形的面積
Volume of pyramid from triangular prism
畢氏樹
五複合正六面體
Discover Topics
Fractions
Sphere
Similarity Transformation or Similarity
Multiplication
Pyramid