document.write ("<b>上一篇</b>：<a href='/DocHtml/792/2016/1/15/7614698132293.html'>数学手抄报</a><br><b>下一篇</b>：<a href='/DocHtml/792/2009/12/17/859632652435.html'>“千年难题”之一：Ｐ（多项式算法）问题对ＮＰ（非多项式算法）问题</a>")