6.
a)37850, 37852, 37854, 37856, 37858, 37860,37862.
b) 156005, 156007, 156009, 156011, 156013, 156015, 156017, 156019, 156021, 156023, 156025, 156027, 156029, 156031, 156033.
c)197003, 197002, 197001, 197000, 196999...
d) 181010, 18114, 18115...
7.
47=48, 82, 100, 770, 1423, 123670
127800=130000, 11400=11000
