maio

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Se <span class="re3">$a_i$</span> é uma progressão aritmética, então:
<span class="re3">$$ \<a href="http://www.golatex.de/wiki/index.php?title=%5Csum"><span class="kw1">sum</span></a>_<span class="sy0">{</span><span class="re9">i = 1</span><span class="sy0">}</span>^n a_i = (a_1 + a_n) * <span class="sy0">\</span><a href="http://www.golatex.de/wiki/index.php?title=%5Cfrac"><span class="kw1">frac</span></a><span class="sy0">{</span><span class="re9">n</span><span class="sy0">}{</span><span class="re9">2</span><span class="sy0">}</span> $</span>$