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作者：
Розалина Паунова
GeoGebra
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apec
רישום חופשי
Export grapfics view
bewijs stelling van Pythagoras
Parallel Lines and Angles: Thinking Classroom Exploration
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Линейная комбинация
Test ratio question
Parallelogram properties
Gears in a rotated reference frame
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二維向量
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