已知函数y＝ ＋ 的最大值为M，最小值为m，则 的值为(　　)

试卷相关题目

SQL Error: select id,body,options from ***_enewstiku_ where sourceid='16562' and id < 1440892 and id<>'1440892' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='16562' and id > 1440892 and id<>'1440892' order by id asc limit 5