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内凹的正方形
Author:
宋晓燕
GeoGebra
New Resources
盈利與虧蝕
百分數及其應用
第八周作业3
常见四边形是否是双心四边形
正方形雪花图案
Discover Resources
y=(x-a)²的圖形
gjh-g04-01 差的平方公式
四下_面積（一）(學生版)
bang
直方圖_Demo的副本
Discover Topics
Vectors
Geometric Transformations
Statistics
Dilation
Vectors 3D (Three-Dimensional)