ann

谢谢了，第一次遇到这样的题，学习了

@echo off
setlocal enableDelayedExpansion
set /a A=%random%%%5*9
set /a B=(%random%%%3+1)*3
set fuhao="-+*/"
:calc
set /a n+=1
set /a RS=A!fuhao:~%n%,1!B
echo %A% !fuhao:~%n%,1! %B% = %RS%
if not "%n%"=="4" goto :calc
pause>nul
goto :eofCOPY