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d.innerHTML = d.innerHTML + '<a class=\"download_word download_word_lb\" href=\"javascript:;\" id=\"vipdown\" onclick=\"showpay(2)\"><div class=\"download_card\"><div class=\"card_nr card_nr_lb\"><h4 class=\"card_bt\">“转圈”中的数学</h4><div class=\"download_card_msg\">，老师和学生共同明确了多边形的外角及外角和的意义后，提出问题：请你想一想，下列图中三角形、四边形和五边形的外角和m3、m4及m5，哪个大？然后分组计算讨论．T：同学们有什么发现？S1：它们的外角和总是360°，与边数无关．T：那为什么多边形的内角和与边数有关，而多边形的外角和总是一个周角呢？你不感觉到意外吗？(激发求知欲望）S2：可以用内角和（n－2).180°来说明它的正确性．（具体推导略）T：不错．哪位同学能有更确切的见解？比方说你们由周角会想到什么？(点击思维火花）S3：每个顶点处转动一个角度，正好。下面小编给大家分享“转圈”中的数学，希望能帮助到大家。 “转圈”中的数学文档下载网址链接：</div></div><div class=\"download_card_btn download_card_btn_lb\"><div class=\"content_box_tj\"><span>推荐度：</span><img src=\"/skin/zhann/images/icon_star.png\" alt=\"\">	<img src=\"/skin/zhann/images/icon_star.png\" alt=\"\">	<img src=\"/skin/zhann/images/icon_star.png\" alt=\"\">	<img src=\"/skin/zhann/images/icon_star.png\" alt=\"\"></div><div class=\"downlod_btn_right demo_tc downlod_btn_right_lb\"><em class=\"downlod_icon\"></em>点击下载文档<span>文档为doc格式</span></div> </div></div></a>';
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