几道数字规律题
1.2,8,24,64,().
A.88B.98C.159D.160
3.4,11,30,67,().
A.120B.110C.140D.128
4.11,33,73,(),231.
A.113B.137C.153D.177
请说明为什么,这些题如何入手好呢?