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平行線法
Author:
chen mingchuan
GeoGebra
New Resources
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）
兩位數除以一位數（二）
兩組對邊相等的四邊形
Discover Resources
Equal chords and their distances from the centre
onemove
椭圆滚动
学习 CAS 计算器
龙形曲线-分形龙2
Discover Topics
Rational Numbers
Step Functions
Confidence Interval
Matrices
Plane Figures or Shapes