µÚ¢ñ¾í
Ò»¡¢Ñ¡ÔñÌ⣺±¾´óÌâ¹²12СÌ⣬ÿСÌâ5·Ö£¬¹²60·Ö£¬ÔÚÿСÌâ¸ø³öµÄËĸöÑ¡ÏîÖУ¬ÓÐÇÒÖ»ÓÐÒ»Ïî·ûºÏÌâÄ¿ÒªÇó£®
£¨1£©ÒÑÖª¼¯ºÏA£½{x|x2£­5x£«6≤0}£¬B£½{x||2x£­1|£¾3}£¬Ôò¼¯ºÏA∩B£½
£¨A£©{x|2≤x≤3} £¨B£©{x|2≤x£¼3}
£¨C£©{x|2£¼x≤3} £¨D£©{x|£­1£¼x£¼3}
£¨2£©1£­i(1£«i)2£«1£«i(1£­i)2£½
£¨A£©£­1 £¨B£©1 £¨C£©£­i £¨D£©i
£¨3£©ÈôÏòÁ¿a¡¢bÂú×ã|a|£½|b|£½2£¬aÓëbµÄ¼Ð½ÇΪ60£¬a•(a£«b)µÈÓÚ
£¨A£©4