When paying for things in the mall, the salesman often asks politely, "Excuse me, do you have any change?" So prepare some small change before you go shopping. Here is a question about preparing small change.
RMB 9, including 1 dime, 1 dime, 1 dime, 1 dime, 4 yuan coins and 2 yuan coins. How many currencies can these banknotes pay at will?
With four Zhang Yiyuan dollars and two five-dollar coins, you can pay five different RMB from 0 yuan to 14 yuan *** 15 yuan.
With 1 dime, 1 dime, 1 dime, you can pay 0, 1, 2, 3, 5, 6, 7, 8 * * 8 different angles.
The combination of element number and angle number, * * * has
15×8= 120 (species).
But when making payment, "paying 0 yuan 0 points" means not giving money, which should be an exception.
120-1=119 (species),
Therefore, * * * can pay 1 19 different amounts.
In the process of solving the above problems, the 0 yuan is skillfully used, so that the problems that need to be discussed under various possible circumstances can be handled in a unified way.