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20180409 同分母分數減法 1ST FIXED
Author:
makkei
GeoGebra
New Resources
正方形雪花图案
第八周作业2
圓的基本性質
常见四边形是否是双心四边形
盈利與虧蝕
Discover Resources
waaachen
星八面體
Ambiguous Cylinder illusion
推移矩陣（x 方向）
拼出三角形的副本
Discover Topics
Bar Chart or Bar Graph
Frequency Distribution
Median Line
Vectors 3D (Three-Dimensional)
Cylinder