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反射定律 Law of Reflection
Author:
W.L. Wong, Albert
GeoGebra
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小数 的副本
【案例】2018年全国1卷理科12题
兩位數除以一位數（一）
判斷球體
兩組對邊相等和有直角的四邊形
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PreEnigma-1
ex_1
堆朵
操場
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Secant Line or Secant
Power Functions
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