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重难题组周练（1）——二次函数
Author:
程洁
Topic:
Quadratic Functions
GeoGebra
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兩位數加法
兩組對邊相等的四邊形
柱體建築師
畫出對稱圖形
第八周作业
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滑桿動畫
example 3
Copy of 圖四
周界-平移法(練習二)
sin(x) 的函數圖形的副本
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Geometry
Surface
Symmetry
Parallelogram
Limits