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	<title>eScire - Nuevas tecnologías y educación &#187; logaritmos</title>
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		<title>Ecuaciones logarítmicas y exponenciales</title>
		<link>http://www.escire.com/2010/02/ecuaciones-logaritmicas-y-exponenciales/</link>
		<comments>http://www.escire.com/2010/02/ecuaciones-logaritmicas-y-exponenciales/#comments</comments>
		<pubDate>Mon, 22 Feb 2010 17:39:14 +0000</pubDate>
		<dc:creator>Aurora Lucas</dc:creator>
				<category><![CDATA[Logaritmos y exponenciales]]></category>
		<category><![CDATA[Matemáticas C.C.S.S. 1]]></category>
		<category><![CDATA[exponenciales]]></category>
		<category><![CDATA[logaritmos]]></category>

		<guid isPermaLink="false">http://www.escire.com/?p=1251</guid>
		<description><![CDATA[Resuelve utilizando las propiedades de logaritmos y exponenciales: 1. 2x + 2x+1 + 2x+2 = 112 2. 3x + 31-x = 4 3. log(x+1) – log((5+x)1/2) = log((5-x)1/2) 4. 2logx – log(x+6) = 1 5. 4x + 5.2x – 6 = 0 2x+1=64 3x+2=81 logx=-1 2logx &#8211; log(x-16)=2 logx=1+log(22-x) 3x+1=81 2x-1 + 2x + 2x+1=7 [...]]]></description>
			<content:encoded><![CDATA[<p>Resuelve utilizando las propiedades de logaritmos y exponenciales:<br />
1.  2<sup>x</sup> + 2<sup>x+1</sup> + 2<sup>x+2</sup> = 112<br />
2. 3<sup>x</sup> +  3<sup>1-x</sup> = 4<br />
3. log(x+1) – log((5+x)<sup>1/2</sup>) =  log((5-x)<sup>1/2</sup>)<br />
4. 2logx – log(x+6) = 1<br />
5. 4<sup>x</sup> +  5.2<sup>x</sup> – 6 = 0</p>
<p>2<sup>x+1</sup>=64<br />
3<sup>x+2</sup>=81<br />
logx=-1<br />
2logx &#8211; log(x-16)=2<br />
logx=1+log(22-x)<br />
3<sup>x+1</sup>=81<br />
2<sup>x-1</sup> + 2<sup>x</sup> + 2<sup>x+1</sup>=7<br />
5.2<sup>x</sup> + 4<sup>x</sup> &#8211; 4 = 0<br />
4<sup>x</sup> &#8211; 5.2<sup>x</sup> &#8211; 6 = 0
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