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反射定律 Law of Reflection
Author:
W.L. Wong, Albert
GeoGebra
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三位數除以一位數（一）
兩組對邊相等的四邊形
拼砌四邊形
錐體建築師
【案例】2018年全国1卷理科12题
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調整頂點位置,對函數是的影響
比較角的大小三
國旗
五点共圆
雙曲線1 焦點法
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Fractions
Quadratic Equations
Pythagoras or Pythagorean Theorem
Step Functions
Congruence