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task4
Author:
chong yin tung
task4
GeoGebra
New Resources
兩組對邊相等和有直角的四邊形
找出對稱軸
sanjiaohanshu
三位數除以一位數（二）
兩組對邊相等的四邊形
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北區模考非選第二題 (2014.03.06)
定義拋物線
黎曼和
橢圓軌跡
集合间基本关系(wd)
Discover Topics
Continuity
Linear Functions
Trigonometry
Limits
Subtraction