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重难题组周练（1）——二次函数
Author:
程洁
Topic:
Quadratic Functions
GeoGebra
New Resources
找出對稱軸
兩組對邊相等和有直角的四邊形
sanjiaohanshu
直角坐標平面上的旋轉變換
【案例】2013年安徽高考15题
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立體圖
商高定理1
滾動的圓
利用對摺找內心
立體三角測量(例七&八)
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Expected Value
Logarithm
Parallelogram
Combinatorics
Congruence