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一元二次方程应用题是初中数学学习的一个重点.你是否知道,近年来中考中,出现的这种应用题有时还与不等式(组)应用题联合起来,融为一体.现举例介绍如下:例1(2015年长沙市中考题)现代互联网技术的广泛应用,催生了快递行业的高速发展,据调查,长沙市某家小型“大学生自主创业”的快递公司,今年3月份与5月份完成投递的快递总件数分别为10万件和12.1万件.现假定该公司每月的投递总件数的增长率相同.
The application of the quadratic equation is one of the focuses of junior high school mathematics learning. Did you know that in recent years, such application problems appear in combination with the inequality (group) applied questions, and are integrated as an example: Example 1 (Changsha 2015 senior high school entrance examination questions) The wide application of modern Internet technology, gave birth to the rapid development of the express delivery industry. According to the survey, a small “college students start their own ” express delivery company in Changsha in March and May The total number of couriers delivered was 100,000 and 121,000 respectively, now assuming the same rate of increase for the company’s total monthly deliveries.