sprt和fbs报错？我不是用了<math.h>了吗

报错是
C:\Users\ADMINI1\AppData\Local\Temp\cc7UQZKy.o 未命名3.c:(.text+0x66): undefined reference to `sprt'
C:\Users\ADMINI1\AppData\Local\Temp\cc7UQZKy.o 未命名3.c:(.text+0x77): undefined reference to `fbs'
C:\Users\Administrator\Documents\collect2.exe [Error] ld returned 1 exit status

你拼写错了，应该是sqrt