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 <question type="category"><category><text>MATE CCSS I/Tema 2 -Ecuaciones y sistemas de ecuaciones/Problemas</text></category></question>
 
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      <text>Pregunta 18</text>
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      <text><![CDATA[<!--[if gte mso 9]><xml>
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</xml><![endif]--> <p class="MsoNormal"><span style="font-size: 10pt;">La suma de las dos cifras de un número es igual a 9. Si lo invertimos, el número obtenido excede en 9 unidades a la cuarta parte del número dado. El número es:</span></p> <!--[if gte mso 9]><xml>
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