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 <question type="category"><category><text>1MA 04. VECTORS/1MA.04.0 Preguntes sobre teoria</text></category></question>
 
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      <text>1MA.04.0.34PT Base</text>
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      <text><![CDATA[<div align="justify"><span style="color: #006600;"><strong>Dos vectors (a,b) i (c,d) són base si </strong></span>{1:MC: ~=ad-bc ~ac+bd} <span style="color: #006600;"><strong>és </strong></span>{1:MC: ~=diferent de zero ~igual a zero}.<br /><br /><br />
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