一道英文数学题,If a $25,000 machine depresses $800 per year or 10% of its original value each year,find a function that expresses the machine's value v after t years have passed.If this machine has no salvage value,what is the useful life of this machine?
问题描述：
一道英文数学题,
If a $25,000 machine depresses $800 per year or 10% of its original value each year,find a function that expresses the machine's value v after t years have passed.If this machine has no salvage value,what is the useful life of this machine?
答
v=25000-800t
when v=0, t=31.25, so the useful life of the machine is 31.25 years
答
如果一个25000美元的机器压抑800美元每年10%的原有的价值,或者找一个函数,每年的价值,体现了机器后第五十年过去了。如果这台机器没有损耗,这台机器最有益的生活是什么?
答
假如一台价值$25,000 的机器每年贬值 $800 或原价的10%,列出一个表达机器价值 v 在过了 t 年以后的函数.如果这台机器不存在补救价值,那么设台机器的寿命会有多久?
该题的答案是：
1.v=25000-800t
当 v=0,t=31.25时,
其结果是：31.25 年