实际问题与一次函数图象

• 作 者: 徐若翰
• 机 构: 上海市大同初级中学,
• 出 处: 数学大世界(初中生适用)
• 发表日期: 2010年04期
• 关键词: 函数式 函数关系式 比甲 行驶时间 最后一次 五甲

在表述数学的实际问题时,可以用一次函数图象提供信息,配合文字叙述,既直观,又便于计算.解题时,我们不但要应用函数关系式,还要理解题意,特别要重视自变量的取值范围.例1某县决定在A、B两村之间修筑一条公路,甲、乙两个工程队分别从A、B两村同时相向开始修筑.施工期间,乙队因另有任务提前离开,余下的任务由甲队单独完成,直到道路修通.如图是甲、

When expressing the actual problem of mathematics, you can use a function image to provide information, with the text description, not only intuitive, but also easy to calculate. When solving a problem, we not only apply the function relationship, but also to understand the meaning of the problem, with particular attention to Range of values ​​of variables. Example 1 A county decides to build a road between the two villages A and B. The two engineering teams A and B will start construction from the two villages A and B at the same time. The task leaves early and the remaining tasks are completed by the A team alone until the road is completed.