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<div align="center"><br /> <table style="background-color: #ffffcc; background-image: url('http://lcmates.eu/none'); color: #000099; border-color: #003300; border-width: 4px; float: none; text-align: left; vertical-align: top; border-style: solid; width: 459px;" border="4" frame="void" rules="none"> <tbody> <tr> <td style="background-color: #003300; background-image: url('http://lcmates.eu/none'); color: #ff9900; text-align: center; vertical-align: middle; border-style: none; width: 100%; border-color: #003300; border-width: 1px;" valign="top"><span style="font-size: large; color: #ffff99;">Progressió aritmètica</span></td> </tr> <tr> <td valign="top" width="NaNpx"> <div style="text-align: justify;" align="center"><strong><span style="color: #003300; font-size: small;">En una progressió aritmètica, cada terme es dedueix de l'anterior sumant una quantitat fixa anomenada diferència: </span></strong></div> <div style="text-align: center;" align="center"><strong><span style="color: #003300; font-size: small;">a<sub>n</sub> = a<sub>n-1</sub> + d<br /></span></strong></div> <br /><strong><span style="color: #003300; font-size: small;">El terme general és a<sub>n</sub> = a<sub>1</sub> + (n-1)d</span></strong><br /><strong><span style="color: #003300; font-size: small;">I la suma dels n primers termes es calcula amb:</span></strong><br /> <div align="center"><strong><span class="nolink" style="color: #003300; font-size: small;">«math xmlns=¨http://www.w3.org/1998/Math/MathML¨»«mstyle mathsize=¨14px¨»«mrow»«msub mathcolor=¨#003300¨»«mi mathvariant=¨bold¨ mathcolor=¨#003300¨»S«/mi»«mi mathvariant=¨bold¨»n«/mi»«/msub»«mo mathvariant=¨bold¨ mathcolor=¨#003300¨»=«/mo»«mfrac mathcolor=¨#003300¨»«mrow»«mi mathvariant=¨bold¨»n«/mi»«mo mathvariant=¨bold¨»(«/mo»«msub»«mi mathvariant=¨bold¨»a«/mi»«mn mathvariant=¨bold¨»1«/mn»«/msub»«mo mathvariant=¨bold¨»+«/mo»«msub»«mi mathvariant=¨bold¨»a«/mi»«mi mathvariant=¨bold¨»n«/mi»«/msub»«mo mathvariant=¨bold¨»)«/mo»«/mrow»«mn mathvariant=¨bold¨»2«/mn»«/mfrac»«/mrow»«/mstyle»«/math»</span></strong></div> </td> </tr> </tbody> </table> </div>
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