填空题:全集U，集合M，N如图l—7所示，用列举法表示M，N，<img alt="" src="http://www.weimei168.com/uploads/202208/20120915141786568656.gif" />UM，<img alt="" src="http://www.weimei168.com/uploads/202208/20120915141722732273.gif" />UN． <br /> <img alt="" src="http://www.weimei168.com/uploads/202208/16261446423951.gif" />