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综合（2）15.&摆线问题
Author:
Sylvie
GeoGebra
New Resources
比較五件物件的重量
第八周作业3
盈利與虧蝕
百分數及其應用
双心四边形
Discover Resources
證平行四邊形 (對邊相等)
旋转文本
單一物件連續動畫
线段-视觉差
函数
Discover Topics
Function Graph
Linear Programming or Linear Optimization
Perimeter
Volume
Diagrams