Ұν֡һԴիŸôһ٩ֻ۾ֱˣס˵漰Ĺ桢漼˵Щ߰Ĺϵÿһ˵ôһεʳҶ˽⣬ֱֶϹҪǰѧʡ
˵ϸǴ㳤ڹڷչȥˣſˮҵĹŶ˸飬Ȼܼ˵ϸģȻֵˣ˵ʲôҲ㲻ܡֵһ˼ʲôҪԸ¹ǵɽֻҪƹкһұ۾ƨһ
ȼģϾĸƸһ飺¯һвȻ֪ʲộ˳ǸײưոݡDZָ᳹ʾսӵˣսӵˡ˿ӡһ£ʵҪȥͰˣһֱֵ⡣
һҪѵ⽻һӣֻ۾Ц죬ñҿڣιҵ簥öĽ鰡⣬⣬Ⱕιҵÿһңҡ˵ſϳ֪еݵijɷ棬ϾôãһҲԸƱֽ
ұߴʼӽлģͬ־һ˵Ҫȥshirly̱ʾҲҪͬȥζҪҵϲơ˵С¶ֻûһƲأûӲ˵˱ƻ飬ÿ˵ĻβٰģDzҲҪֶҾȥҪķ淢չʹס˻ͷԼһ֮ڻʢٻ档
Ǹ£ĻƱdzø㣬ǮУϱߵļshirlyҲоԱ˵ҪȥǻӭDZ߸Ҵһ֤ļ˵俼ѧרңγǸѧٽĻΪļĹϵ˳õ˶ǩ֤չ֮еǰࡣ
֮ǰȥ绰һԴիķֵ˵绰DZߵĸ˽ѦһɣүӰݰӵֵܡһ˵Ҫȥڵ绰ͿҹȥʱǧǵðүӵĹǻ̳Ӵϣ˽ֵүǶи˵ɣүӱȽֻ̣á˸رʣʬһԴիĿⷿͣأ˳ºذҿˣ˵ҵڸʬѦһֿʼޣ˵Ǿʹүӵ·¹ڣҲǺõġֻôӦ֮ǰȥⷿɣүӰ˼ݣȡһ˱
ҪȥϺΪУ˵ܵչ˰ɣ˵Ъ첻Ҫһ£һءһʱDZ߽˻ȣԺֵܵһ棬ҪùҵӰ¡ͷ͵ȥϺˡ
ʥȪѰ ʮ ֮ 1(1/2),һҳĶ