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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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【案例】圆柱体内放置一个大球六个小球
拼砌四邊形
算柱 (兩位數)
判斷球體
異分母分數減法
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最小平方法
線性規劃 - 數學技巧1
三個硬幣的正面數
圓方程式
乘法的副本
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Reflection
Step Functions
Upper and Lower Sum or Riemann Sum
Tree Diagrams
Fractal Geometry