437153

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