标题: 问一个超级简单的数学题~~~~~~~~~~~~ [打印本页] 作者: 汪撕葱 时间: 2018-3-15 15:44 标题: 问一个超级简单的数学题~~~~~~~~~~~~ The charge for a telephone call between City R and City S is $0.42 for each of the first 3 minutes and $0.18 for each additional minute. A certain call between these two cities lasted for x minutes, where x is an integer. How many minutes long was the call?
请问each of the first 3 minutes 是说前三分钟一共是0.42 还是说前三分钟，每一分钟是0.42呢
