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平行四邊形的高
Author:
whtong
GeoGebra
New Resources
画直线等分三角形的面积
找出對稱軸
【案例】圆柱体内放置一个大球六个小球
異分母分數減法
兩位數除以一位數（二）
Discover Resources
Spotlight 探射燈
齒輪作圖
平移法（三）
初中数学
双镜面反射问题
Discover Topics
Stochastic Process or Random Process
Circle
Statistics
Percentages
Pythagoras or Pythagorean Theorem