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詠甯
GeoGebra
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找出對稱軸
兩位數加法
球體建築師
三位數除以一位數（二）
【案例】2018年全国1卷理科12题
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棋聖加油
橢圓教學_2016
rotational symmetry_3
Volumen ablesen 2
相似三角形的一种动态构造.许兴华数学
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Congruence
Continuity
Set Theory
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Derivative