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<p> </p> <div align="center"> <table style="color: #ffcc00; border: 4px solid #000066; float: none; text-align: center; vertical-align: top; width: 400px; background-image: url('http://www.insmilaifontanals.cat/none'); background-color: #000066;" border="4" frame="void" rules="none"> <tbody> <tr> <td valign="top" width="NaNpx"><span style="font-size: large; color: #ffff99;" data-mce-mark="1">Quadrat d'una suma/diferència</span></td> </tr> <tr> <td style="background-image: none; color: #000066; text-align: justify; vertical-align: top; border-style: none; background-color: #ffffcc;" valign="top" width="NaNpx"><br /> <div align="center"><span style="color: #000000; font-size: x-large;" data-mce-mark="1"><strong><em>(<span style="color: #0000ff;" data-mce-mark="1">a</span> + <span style="color: #ff0000;" data-mce-mark="1">b</span>)<sup>2</sup> = </em></strong></span><span style="color: #000000; font-size: x-large;" data-mce-mark="1"><strong><em><span style="color: #0000ff;" data-mce-mark="1">a</span><sup>2</sup> + 2<span style="color: #0000ff;" data-mce-mark="1">a</span><span style="color: #ff0000;" data-mce-mark="1">b</span> + <span style="color: #ff0000;" data-mce-mark="1">b</span><sup>2</sup></em></strong></span><span style="font-size: x-large;" data-mce-mark="1"><br /></span></div> <div align="center"> <div align="left"><span style="color: #000000;"><em>Exemples:<br /></em><strong><em>(<span style="color: #000000;">4x</span> + <span style="color: #000000;">9</span>)<sup>2</sup> = (<span style="color: #000000;">4x</span>)<sup>2</sup> + 2·<span style="color: #000000;">4x</span>·<span style="color: #000000;">9</span> + (<span style="color: #000000;">9</span>)<sup>2</sup> = 16x<sup>2 </sup>+ 72x + 81</em></strong></span><br />Però: <br /><span style="color: #000000;"><strong><em>(<span style="color: #000000;">4x</span> <span style="color: #ff0000;">–</span> <span style="color: #000000;">9</span>)<sup>2</sup> = </em></strong></span><span style="color: #000000;"><strong><em><span style="color: #000000;"><strong><em>(<span style="color: #000000;">4x</span> + <span style="color: #ff0000;">(-9)</span>)<sup>2</sup> =<sup> </sup></em></strong></span></em></strong></span><span style="color: #000000;"><strong><em> 16x<sup>2 </sup><span style="color: #ff0000;">–</span> 72x + 81</em></strong></span></div> </div> </td> </tr> </tbody> </table> </div> <p><br /><br /></p> <div style="text-align: center;"> </div>
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Monday, 29 June 2015, 3:42 PM
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