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    <title>Задача 9</title>
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    <h3>Волшебные формулы</h3>
    (x+y)<sup>3</sup>=x<sup>3</sup>+3x<sup>2</sup>y+3xy<sup>2</sup>+y<sup>3</sup><br>
    &#916;x<sub>1</sub>+	&#916;x<sub>2</sub>+&#8230;+&#916;x<sub>n</sub>=&#931;&#916;x<sub>k</sub><br>
    Если &forall; x &isin; R такого, что |x|&le;1 &exist;y&ge;1, то 	&#958;&lt;&infin;<br><br>
    <hr>
    <address>@www.itmathrepetitor.ru</address>
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