应该是,两组两组结合,前两位加2,后两位加3,连续不断,同时两组相邻全在前一组数的后一位上6再减4再减2,连续不断,
如接下来是37-2=35,35+5=40,40-0=40,40+6=46,46-(-2)=48,48+7=55