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練習－由一元二次方程判別根的數目
Author:
Lau Sir
GeoGebra
New Resources
兩組對邊相等的四邊形
【案例】圆柱体内放置一个大球六个小球
三位數除以一位數（二）
【案例】2013年安徽高考15题
算柱 (兩位數)
Discover Resources
Apollonius Problem gergonne 2
勝者即正義
放大／縮小 Resize
酷狗音乐
萬花筒
Discover Topics
Quadrilaterals
Frequency Distribution
Geometric Transformations
Parallelogram
Trapezoid