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椭圆展开
Author:
朱亮
GeoGebra
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兩組對邊相等的四邊形
異分母分數減法
四邊形的特性
【案例】2018年全国1卷理科12题
三位數除以一位數（二）
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三角柱算體積(可以切開)
橢圓軌跡04
椭圆内光线的反射
拋物線4-平行四邊形法
求公切線段長
Discover Topics
Piecewise Functions
Equilateral Triangles
Planes
Quadrilaterals
Conditional Probability