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二次函数y=ax²（a＞0)
Author:
吕胜
GeoGebra
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四邊形的特性
兩位數加法
畫出對稱圖形
第八周作业
兩位數除以一位數（二）
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畫三角形 題3d
Quiz on Compass Bearings 羅盤方位角：測驗
判斷柱體 1
椭圆的定义的副本
陳允杰 橢圓反射
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Limits
Real Numbers
Intersection
Upper and Lower Sum or Riemann Sum
Division