回复：公务员考试: 数列推理: 看看你能做几道

The first one is also easy:

The sequence
2, 3/2, 10/9, 7/8, 18/25,?
is equivalent to:
2/1, 6/4, 10/9, 14/16, 18/25,
so the next term should be 22/36=11/18.

The last two are really hard:)