【例7.1】保留3位小数

Status	Submit By	Time	Memory	Language	Code	Submit At
AC	zhuyinuo	8ms	760 KiB	C++98	145 Bytes	2025-1-21 14:47:17
AC	chengxinhao	8ms	760 KiB	C++98	134 Bytes	2025-3-16 18:09:53
AC	lihaorui	8ms	536 KiB	C++98	129 Bytes	2025-1-20 17:51:53
AC	wangyonglin	9ms	764 KiB	C++98	138 Bytes	2024-7-24 9:31:04
AC	jiashixuan	9ms	552 KiB	C++98	124 Bytes	2024-7-18 22:09:34
AC	jihaoyuan	9ms	532 KiB	C++98	140 Bytes	2025-1-20 15:42:16
AC	nianyanimen	9ms	556 KiB	C++98	138 Bytes	2024-7-24 9:46:38
AC	xuwenze	104ms	3.9 MiB	Python 3	33 Bytes	2025-1-20 11:31:03
AC	lijirui	104ms	4 MiB	Python 3	32 Bytes	2025-1-20 10:52:02