The analytical formula is: Y=6/5X,

(2) According to the meaning of the problem, the equations are obtained:

6=3K+b，

- 1/2= 1/2K+b，

Solution: K= 13/5, b=-9/5,

The analytical formula is: Y= 13/5X-9/5.

5, image omission:

⑴X & gt； 5、⑵X & lt； 5。

6、c=2+0.5(p- 1)

c = 1.5+0.5p(p≥2)。