【例7.1】保留3位小数

Status	Submit By	Time	Memory	Language	Code	Submit At
AC	宋帅	8ms	552 KiB	C++14	132 Bytes	2025-5-3 18:20:51
AC	xiaozheng	8ms	536 KiB	C++14	151 Bytes	2024-12-28 16:02:38
AC	xiongyining	8ms	768 KiB	C++14	144 Bytes	2024-12-24 17:21:41
AC	liangbo	9ms	536 KiB	C++14	154 Bytes	2024-12-28 16:03:03