17.2- 10=7.2

7.2÷ 1.2=6

Therefore, the greatest value of Li Ming's Journey to x(㎞) lies in 6+5= 1 1㎞.

The range is 10.

2、

Solution: If the price of biscuits is X yuan/box, then the price of milk is10-0.8-9x/10 = 9.2-0.9x yuan/bag. According to the meaning of the question:

10-x & lt； 9.2-0.9x

x & lt 10

Solution 8

Because x is an integer.

So x=9.