题目内容
(1)7,77,777,7 777,…;
(2),….
(1)2,4,2,4,2,4,…;
(2)-1,,-,,-,,…;
(3)0.6,0.66,0.666,0.666 6,….
(1),,,,…;
(2)-1,,-,,…;
(3)5,55,555,5555,…;
(4),1,,,…;
(5) ,-,,-,….