?$1÷7= 0.\dot {1}4285\dot {7}$?
?$9÷7= 1.\dot {2}8571\dot {4}$?
?$12÷7= 1.\dot {7}1428\dot {5}$?
?$24÷7= 3.\dot {4}2857\dot {1}$?
?$32÷7= 4.\dot {5}7142\dot {8}$?
答：所得的商都是循環(huán)小數(shù)，循環(huán)節(jié)都是由?$1，$??$4，$??$2，$??$8，$??$5，$??$7$?這?$6$?個數(shù)字組成，
有規(guī)律的按順序排列。
