用6,6,6,6,0,0,0这七个数字组成的七位数,共能组20个,从大到小分别是:
6666000666060066600606660006660660066060606606006
6600660660060666000666066600606606060660066060660
606060660600666006660600660660060666000666
其中“0”没有读出的从大到小分别是:
666600066066006006660
其中“0”需要读出的从大到小分别是:
6660006660660066060606606006660066066006066600066
6066600606606060660066060660606060660600666006660
600660660060666000666.