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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
異分母分數減法
球體建築師
三位數除以一位數（二）
判斷球體
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Quiz on Simplifying Monomials 化簡單項式：測驗
總結
對頂角_1
圆的面积原理
三角形的三线
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Ratios
Parametric Curves
Reflection
Translation
Inequalities