1)5 、 15 、45 、( 135 )、 ( 405)

2. Add 5, 15 and 25, and so on.

2)2 、 7 、22 、 (47)、(82 )

This is very simple, 3 times 4, 3 times 4, and so on.

3)9 、36 、 12 、 48 、 16 、(64 )、 (2 1.3333 )

I don't know if it's right. The last one is circular decimal, which has not been done for a long time.