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斜率乘积为定值（椭圆、双曲线）
Author:
蔡永志
Topic:
Ellipse
,
Hyperbola
斜率乘积为定值
GeoGebra
GeoGebra
New Resources
兩組對邊相等和有直角的四邊形
三位數除以一位數（一）
算柱 (兩位數)
球體建築師
兩位數除以一位數（一）
Discover Resources
trigonometry1
How to draw a triangle with ruler and compasses?
三角形內角和
碎形
等差数列计算练习
Discover Topics
Function Graph
Congruence
General Quadrilateral
Parabola
Continuity