(1)120,60,24,( ),0 A
A6 B12 C7 D8
(2)4,12,39,20( ) C
A227 B22 C228 D225
(3)-5/2,5/1,-750/8,( ) A
A375/11 B375/9 C375/7 D375/8
120 -6×10 60 -6×6 24 -6×2 6 0???
不知道~