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\documentclass[11pt,letterpaper,twocolumn]{article}
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\usepackage{preambulo}
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\begin{document}
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\twocolumn[\begin{@twocolumnfalse}
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\subfile{secciones/0.1_datos.tex}
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\subfile{secciones/0.2_resumen.tex}
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\end{@twocolumnfalse}]
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\subfile{secciones/1_introduccion.tex}
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\subfile{secciones/2_metodologia.tex}
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\subfile{secciones/3_resultados.tex}
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\subfile{secciones/4_discusion.tex}
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\subfile{secciones/5_conclusiones.tex}
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\subfile{secciones/referencias.tex}
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\end{document}
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