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App2-9-21
作者：
Janet Bowers
GeoGebra
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Difference engine Babbage vb 2
立体几何-公理3及推论
Hypocycloids
seo tool
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Internal forces - three-hinged frame with tie
Triangle Congruence Applications - Quadrilateral Properties
Parallelogram Angles Theorem
Relação entre as razões trigonométricas de ângulos com igual amplitude
Algebra Tiles
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