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同旁內角---不平行綫
Author:
chanfushun
GeoGebra
New Resources
【案例】2013年安徽高考15题
判斷球體
柱體建築師
異分母分數減法
三位數除以一位數（一）
Discover Resources
拋物線的光學性質
Clock
Rectangle
旋轉對稱
Angles in a Circle:Property 2
Discover Topics
Hyperbola
Quadratic Equations
Subtraction
Perimeter
Ratios