3.1

<body topmargin=0 leftmargin=0 marginheight=0 marginwidth=0> <table cellpadding=0 cellspacing=0 border=0><tr> <td valign="top" colspan=3 height=24 BGCOLOR="#003366" TEXT="#F7F7FF"> <div> <FONT SIZE="4" COLOR="#FFFFFF" FACE="Bell MT" ><A HREF="index.htm" TARGET="_top" TITLE="Ecuaciones diferenciales"><U><B>Ecuaciones diferenciales</B></U></A><B>  | </B></FONT><A HREF="index.htm" TARGET="_top" TITLE="Ecuaciones diferenciales"><U><B>Home</B></U></A><B> | </B><A HREF="id118.htm" TARGET="_top" TITLE="C o n t e n i d o"><U><B>Contenido</B></U></A><B>  | </B><FONT SIZE="3" COLOR="#FFFFFF" FACE="Georgia" > <A HREF="id30.htm" TARGET="_top" TITLE="D.G. Zill"><U>D.G. Zill</U></A></FONT><FONT SIZE="4" COLOR="#FFFFFF" FACE="Georgia" >  |  </FONT><A HREF="id225.htm" TARGET="_top" TITLE="Ecuaciones lineales de primer orden"><U><B>Apuntes de ecuaciones lineales de primer orden</B></U></A></div> <div> <A HREF="id147.htm" TARGET="_top" TITLE="1.1"><U>1.1</U></A>   |   <A HREF="id148.htm" TARGET="_top" TITLE="1.2"><U>1.2</U></A>   |   <A HREF="id158.htm" TARGET="_top" TITLE="1.3"><U>1.3</U></A>   |   <A HREF="id149.htm" TARGET="_top" TITLE="2.1"><U>2.1</U></A>   |   <A HREF="id152.htm" TARGET="_top" TITLE="2.2"><U>2.2</U></A>   |   <A HREF="id156.htm" TARGET="_top" TITLE="2.3"><U>2.3</U></A>   |   <A HREF="id150.htm" TARGET="_top" TITLE="2.4"><U>2.4</U></A>   |   <B>3.1</B>   |   <A HREF="id153.htm" TARGET="_top" TITLE="4.1.1"><U>4.1.1</U></A>   |   <A HREF="id154.htm" TARGET="_top" TITLE="4.1.2"><U>4.1.2</U></A></div> <div> </div> </td> </tr><tr> <td valign="top" rowspan="2" width=160 BGCOLOR="#FFFFFF" TEXT="#080000"> <div> <B> <script async src="//pagead2.googlesyndication.com/pagead/js/adsbygoogle.js"></script>  <ins class="adsbygoogle" style="display:inline-block;width:160px;height:600px" data-ad-client="ca-pub-1578463498418701" data-ad-slot="3073775660"></ins> <script> (adsbygoogle = window.adsbygoogle || []).push({}); </script>  </B></div> </td> <td valign="top" height=432 BGCOLOR="#FFFFFF" TEXT="#080000"> <div> <B>3.1</B></div> <bR> <div>  <script async src="//pagead2.googlesyndication.com/pagead/js/adsbygoogle.js"></script>  <ins class="adsbygoogle" style="display:inline-block;width:728px;height:90px" data-ad-client="ca-pub-1578463498418701" data-ad-slot="5388515922"></ins> <script> (adsbygoogle = window.adsbygoogle || []).push({}); </script>  </div> <bR> <div> <IMG SRC="7cfb4dd0.gif" border=0 width="692" height="733" ALT="Documento Microsoft Office Word" ALIGN="BOTTOM" HSPACE="0" VSPACE="0"></div> <div> <IMG SRC="7d0b40a0.gif" border=0 width="692" height="778" ALT="Documento Microsoft Office Word" ALIGN="BOTTOM" HSPACE="0" VSPACE="0"></div> <div> <IMG SRC="7d1b48a0.gif" border=0 width="692" height="650" ALT="Documento Microsoft Office Word" ALIGN="BOTTOM" HSPACE="0" VSPACE="0"></div> <div> <IMG SRC="7d2b4230.gif" border=0 width="692" height="547" ALT="Documento Microsoft Office Word" ALIGN="BOTTOM" HSPACE="0" VSPACE="0"></div> <div> <IMG SRC="7d3b4da0.gif" border=0 width="692" height="474" ALT="Documento Microsoft Office Word" ALIGN="BOTTOM" HSPACE="0" VSPACE="0"></div> <div> <IMG SRC="7d4b4bd0.gif" border=0 width="692" height="701" ALT="Documento Microsoft Office Word" ALIGN="BOTTOM" HSPACE="0" VSPACE="0"></div> <bR> <DIV ALIGN="LEFT"></DIV> <div>  <script async src="https://pagead2.googlesyndication.com/pagead/js/adsbygoogle.js"></script>  <ins class="adsbygoogle" style="display:inline-block;width:970px;height:250px" data-ad-client="ca-pub-1578463498418701" data-ad-slot="8553279920"></ins> <script> (adsbygoogle = window.adsbygoogle || []).push({}); </script>  </div> </td> <td valign="top" rowspan="2" width=105 BGCOLOR="#FFFFFF" TEXT="#080000"> <div> <A HREF="https://www.youtube.com/user/MatematicaAplicadas" TARGET="_top" TITLE="https://www.youtube.com/user/MatematicaA"><U><IMG SRC="154c64580.gif" border=0 width="100" height="600" ALIGN="BOTTOM" HSPACE="0" VSPACE="0"></U></A></div> <bR> </td> </tr><tr> <td valign="top" height=24 BGCOLOR="#003366" TEXT="#F7F7FF"> <div> <B> <form action="http://www.google.com.co" id="cse-search-box" target="_blank"> <div> <input type="hidden" name="cx" value="partner-pub-6266400581769473:6497222116" /> <input type="hidden" name="ie" value="UTF-8" /> <input type="text" name="q" size="100" /> <input type="submit" name="sa" value="Buscar" /> </div> </form> <script type="text/javascript" src="http://www.google.com.co/coop/cse/brand?form=cse-search-box&lang=es"></script>  </B></div> </td> </tr></table></body>