ONE QUESTION, ONE STEP
ZX-E6108614F32024年12月A卷 · 第 20 题
2024年12月A卷 · 原库模块 1 · Q20 原库参考解析
A family has money in an account for renting movies online. Each time the family rents a movie, the cost of the rental is withdrawn from the account, and each rental costs the same amount of money. The function \( f\left(m\right)=21-3m \) gives the amount of money, in dollars, in the account after the family has rented m movies. Which of the following represents the amount of money, in dollars, withdrawn from the account each time the family rents a movie?
参考答案：
解题思路
容易忽略的一步
