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兩圓外公切線

Author:郭逸民

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兩組對邊相等和有直角的四邊形
四邊形的特性
sanjiaohanshu
找出對稱軸
【案例】2018年全国1卷理科12题

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task1
堆垛系列
圓冪：到兩點的內積
橢圓3-平行四邊形法
正立方體展開圖

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Logarithmic Functions
Percentages
Standard Deviation
Geometric Mean
Power Functions

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