(1) If 12 weeks are all sold according to this ratio, the order of Y=30-2*(X- 1) is: Y =-2x+32 (0

(2) Assuming that the sales volume of X week can reach 60,800 yuan and the sales volume is m, the sales volume of X week is M= 1200+(X- 1)*400, and the sales volume of X week is y * m = (-2x+32) * [1200.

7-√5≤X≤7+√5, so it can reach 60800 in the 56789th week.

(3) Is this topic a little unclear? According to the sales volume of the second question, by the first week 10, we had sold 4,800 kilograms. How to deal with 5000 kilograms?