文档介绍：列一元一次方程解应用题复****列一元一次方程解应用题复****刘圆圆刘圆圆七年级专项训练七年级专项训练 Evaluation only. Evaluation only. Created with Client Profile . Created with Client Profile . Copyright 2004-2011 Aspose Pty Ltd. Copyright 2004-2011 Aspose Pty Ltd. 列方程解应用题的一般步骤: (1) 审题弄清题意,分清哪些是已知量,哪些是未知量. (2) 找等量关系. (3) 设未知数. (4) 列方程. (5) 解方程. (6) 根据题意,作出答案. 知识梳理 Evaluation only. Evaluation only. Created with Client Profile . Created with Client Profile . Copyright 2004-2011 Aspose Pty Ltd. Copyright 2004-2011 Aspose Pty Ltd. : (1) 图解分析: 分析问题中的数量关系时,借助图形,可以使抽象的关系直观化、简单化,,应要求“图要达意”,避免图上发生错误而造成列式错误. Evaluation only. Evaluation only. Created with Client Profile . Created with Client Profile . Copyright 2004-2011 Aspose Pty Ltd. Copyright 2004-2011 Aspose Pty Ltd. (2) 列表分析: 列表法的优点是通过列表归类使对应量之间关系较为清晰,往往有利于运用比例分析法显示解题思路. (3) 框图分析: 框图分析是由文字语言、符号语言及长方格通过题中相等关系确立而成,容易操作,不拘一格. Evaluation only. Evaluation only. Created with Client Profile . Created with Client Profile . Copyright 2004-2011 Aspose Pty Ltd. Copyright 2004-2011 Aspose Pty Ltd. 例 1 6千米/ 时, 18 分钟后,驻地接到紧急命令, 14 千米/ . 分析:这属于行程问题当中的追及问题,画线段图理解 Evaluation only. Evaluation only. Created with Client Profile . Created with Client Profile . Copyright 2004-2011 Aspose Pty Ltd. Copyright 2004-2011 Aspose Pty Ltd. 例 2 汽船从甲地顺水开往乙地,所用时间比从乙地逆水开往甲地少 18 千米/ 时,水流速度为 2 千米/ 、乙两地间的距离. Evaluation only. Evaluation only. Created with Client Profile . Created with Client Profile . Copyright 2004-2011 Aspose Pty Ltd. Copyright