keen

@echo off
setlocal enableDelayedExpansion
set A=%random%%%5*9
set B=(%random%%%3+1)*3
set "fuhao=+-*/"
:calc
if "!fuhao:~%n%,1!"=="" pause &exit
set/a RS=%A%!fuhao:~%n%,1!%B%
echo A !fuhao:~%n%,1! B = %RS%
set /a n+=1 &goto :calc
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keen

多谢wxcute老大指正！修改如下：

@echo off
setlocal enableDelayedExpansion
set /a A=%random%%%5*9
set /a B=(%random%%%3+1)*3
set "fuhao=+-*/"
:calc
if "!fuhao:~%n%,1!"=="" pause &exit
set/a RS=%A%!fuhao:~%n%,1!%B%
echo %A% !fuhao:~%n%,1! %B% = %RS%
set /a n+=1 &goto :calc
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