论文部分内容阅读
与增长率有关的应用题,学生认为不难,教师教学时也重视不够,没有将有关的题型归类,因而在解答这些应用题时,得不到理想的效果。在教学中,我将这类型的题的变化规律作了一个简要的小结,学生花时间少而收益大,下面就谈谈我的作法。一、弄清增长率、复利公式与等比数列的通项公式的关系: 增长率=完成任务数-计划数/计划数×100％ (1)由(1)得:完成任务数=计划数×(1+增长率) (2) 与增长率概念相同的: 利率=利息/本金×100％(3)由(3)得:本利和=本金×(1+利率) (4) 若利息计算的单位时间为1年,叫年利率,如果
With regard to application problems related to the growth rate, students think that it is not difficult. Teachers do not pay enough attention when they teach. They do not classify relevant questions. Therefore, in answering these application questions, the desired results are not obtained. In teaching, I made a brief summary of the changes in this type of question. Students spend less time and benefit more. Let’s talk about my approach. 1. Find out the relationship between growth rate, compound formula, and the general formula of the geometric series: Growth rate = number of completed tasks - number of plans / number of plans × 100% (1) by (1): number of completed tasks = number of plans × (1 + growth rate) (2) Same as growth rate concept: interest rate = interest/principal × 100% (3) from (3) debenture: principal and principal = (1 + interest rate) (4) The unit time for interest calculation is 1 year, called the annual interest rate, if