document.write ("<b>上一篇</b>：<a href='http://www.hfly.net/DocHtml/285/21/01/00247559.html'>追寻数学之美</a><br><b>下一篇</b>：<a href='http://www.hfly.net/DocHtml/285/21/01/00247557.html'>以说促教助成长</a>")