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平行四邊形有甚麼特性？
Author:
Anthony OR 柯志明
Topic:
Parallelogram
English version:
http://ggbtu.be/m79826
GeoGebra
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找出對稱軸
【案例】2013年安徽高考15题
異分母分數減法
拼砌四邊形
第八周作业
Discover Resources
chap. 1 by ck
Quiz on Addition and Subtraction of Directed Numbers (1) 有向數加減測驗(1)
多重刻度磅
两角和的正弦公式几何证明1
平行四边形
Discover Topics
Sine
Histogram
Rectangle
Quadrilaterals
Circle