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d.innerHTML = d.innerHTML + '<a class=\"download_word download_word_lb\" href=\"javascript:;\" id=\"vipdown\" onclick=\"showpay(1)\"><em></em>下载文档(未登录)九年级数学二次根式知识点描述：提高数学考试成绩诀窍方法之一是，在考试前进行高水平高效率的复习，花时间去攻克自己不熟悉的题目，不断地把陌生转化为熟悉。下面是小编整理的九年级数学二次根式知识点，仅供参考希望能够帮助到大家。九年级数学二次根式知识点① 二次根式的概念：一般地，</a>';
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