在excel中怎样生成随机的4位字母数字组合,谢谢答:产生大写字母与数字的组合 =CHAR(RANDBETWEEN(65,90))=IF(RAND()<0.5,CHAR(RANDBETWEEN(48,57)),CHAR(RANDBETWEEN(65,90))) &IF(RAND()<0.5,CHAR(RANDBETWEEN(48,57)),CHAR(RANDBETWEEN(65,90)))&IF(RAND()<0.5,CHAR(RANDBETWEEN(48,57)),CHAR(RANDBETWEEN(65,90)))&IF(RAND()<0....