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光的折射（光线自右下向左上）
Author:
樊双平
GeoGebra
New Resources
異分母分數減法
兩組對邊相等的四邊形
三位數除以一位數（一）
柱體建築師
【案例】2013年安徽高考15题
Discover Resources
Slope 斜率 - 概念及定義 (3)
離心率與圓錐曲線
normal
HKDSE 2015 by Mr LO WY
动态绘制函数图象
Discover Topics
Median Line
Fractal Geometry
Statistics
General Quadrilateral
Curve Sketching