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正交代换
Author:
Samson Chusaichun
GeoGebra
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兩位數除以一位數（二）
【案例】圆柱体内放置一个大球六个小球
兩組對邊相等和有直角的四邊形
【案例】2018年全国1卷理科12题
【案例】2013年安徽高考15题
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分數的加法
Right Triangles in a Circle 圓內的直角三角形
圓內弦中點軌跡
Apollonius Problem gergonne
圓系
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Ellipse
Tree Diagrams
Fractions
Unit Circle
Piecewise Functions