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 <question type="category"><category><text>1MA 05. RECTES EN EL PLA/1MA.05.0 Preguntes teòriques</text></category></question>
 
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      <text>1MA.05.0.53 PT Vdir de RectaPerpendicular a una altra</text>
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      <text><![CDATA[<p><span style="color: #006600;"><strong>Si una recta és perpendicular a una recta de vector director (a,b), el seu vector director pot ser ({1:SA: ~=-b},</strong></span> <span style="color: #006600;"><strong>{1:SA: ~=a})<br /><br /><br /></strong></span></p>]]></text>
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