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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\">数学教案：用计算器求平均数、标准差与方差</h4><div class=\"download_card_msg\">按  键．教学设计示例1素质教育目标（一）知识教学点使学生会用计算器求平均数、标准差与方差.（二）能力训练点培养学生正确使用计算器的能力.（三）德育渗透点培养学生认真、耐心、细致的学习态度和学习习惯.（四）养育渗透点通过本节课的教学，渗透了用高科技产品求方差值的简单美，激发学生的学习兴趣，丰富了学生具有数学美的底蕴.重点&#183;难点&#183;疑点及解决办法1．教学重点：用计算器进行统计计算的步骤.2．教学难点：正确输入数据.3．教学疑点：学生容易把计算器上的键S主认为是书上的标准差S，教科书中的符号。下面小编给大家分享数学教案：用计算器求平均数、标准差与方差，希望能帮助到大家。 数学教案：用计算器求平均数、标准差与方差文档下载网址链接：</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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