3,6,4,8,6,12,2,()
- A4
- B6
- C8
- D14
1、2/5,3/7,4/10,6/14,8/20,12/28,( )
2/5,3/7,4/10,6/14,8/20,12/28,( )A16/40B14/32C20/48D24/56
3,4, 6,8, 12, ( )。A14B15C17D19
3,4,5,6,9,8,12A2,3,6,5,4,1,8,9B8,3,5,6,2,1,4,9C9,2,5,6,3,4,8,1D4,1,2,6,8,5,9,3
:3,4,6,8,12,()。A14 B15 C17 D19
5、φ(12)=φ(3*4)=φ(2*6)=φ(3)*φ(4)=φ(2)*φ(6
φ(12)=φ(3*4)=φ(2*6)=φ(3)*φ(4)=φ(2)*φ(6)。A正确B错误
2, 8, 4, 6, 3, ( )。A18B16C14D12