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增长率问题属于传统的应用题,在当前的经济生活中占据着比较重要的地位,近几年的高考也经常出现增长率问题. 所谓增长率就是增长数(实际数减计划数)与计划数的百分比,即增长率=增长数/原来的基数(或超额率=超产量/原来产量).连续n次以相同的增长率增长后的量=原来的量×(1+增长率)n,连续n次以相同的递减率减少后的量=原来的量×(1-递减率)n. 增长率问题中较为特殊的一类——利率问题,在工农业生产和经济事务中常常出现.
The problem of growth rate is a traditional application, and it occupies an important position in the current economic life. The growth rate of the college entrance examination in recent years is often a problem. The growth rate is the number of growth (actual number minus plan) and number of plans. The percentage, that is, growth rate = growth number / original base (or excess rate = over production / original output). The amount of growth n times the same growth rate = original amount × (1 + growth rate) n, The quantity that is reduced by the same declining rate for n times in succession = original quantity × (1-regressive rate) n. The special interest rate problem in the growth rate problem - the interest rate problem, often occurs in industrial and agricultural production and economic affairs.