标题: 【求解一道prep上的数学题】感谢~~ [打印本页] 作者: nicholecc 时间: 2010-8-2 20:52 标题: 【求解一道prep上的数学题】感谢~~ An investment of d dollars at k percent simple annual interest yields $600 interest over a 2-year period. In terms of d, what dollar amount invested at the same rate will yield $2,400 interest over a 3-year period?
求解吖~~~thanks~~作者: fly12404 时间: 2010-8-2 21:17
simple annual d 一年賺 600 /2 =300 設另一投資為x x 一年賺2400/3=800 x/d = 800/ 300 =8/3 =>x = 8/3d : ) hope it help !作者: nicholecc 时间: 2010-8-4 18:55
fly thank you very very much!!!!!!!