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救生員的職責
Author:
張庭瑞
GeoGebra
New Resources
異分母分數減法
兩組對邊相等和有直角的四邊形
球體建築師
第八周作业
兩位數除以一位數（二）
Discover Resources
clock
水波干涉
軌跡 直線 (與兩平行線等距)
五邊形
正方体展开图的副本
Discover Topics
Linear Functions
Matrices
Arithmetic Mean
Special Points
Median Value