????:1???????:?????????

2????????

3??????????

4???????

5???????sn

?1??4? ??,??2025????1?4?15????26??????:???????????????1??????4?????????5????,???,?500?????????????????,?????????????????????????200?????,??!

???????????:

1.??????????;

2.????????????????????;

3.???????????;

4.?? ?????:????