( 1)2、3、4、5、6、( )、( )。

(2) 3、6、9、 12、( )、( )。

(3) 19、 17、 15、 13、( )、( )。

(4) 1、3、2、6、3、9、 ( )、( )。

(5) 12、5、 13、5、 14、5、( )、( )。

(6) 1、4、7、 10、 13、( )、( )。

(7) 10、 1、9、2、8、3、7、4、( )、( )。

(8) 5、 10、 15、20、( )、( )。

pay attention to

There are several types of pattern finding, such as geometric figures, such as various series, such as image pattern finding, formula pattern finding, letter pattern finding and so on.

In short, in the face of ever-changing problems, we should always contact the sum and difference of the two, or other laws. Understand carefully and calculate patiently. If you are really confused, you should constantly ask for help, enhance your ability, cultivate your sensitivity to changing invariants, and feel about numbers and pictures.