由1,2,3,4,5这五个数字能组成多少个没有重复数字的被3整除的三位数?答:45132,45213,45231,45312,45321,51234,51243,51324,51342,51423,51432,52134,52143,52314,52341,52431,52413,53124,53142,53214,53241,53421,53412,54123,54132,54231,54213,54321,54312啊啊啊,太多了.总共这些.好像152个数.如果说是N位数,那N个数之和被三整除,那这个数可以被三整除,可以自己试.