① The 25th person has 25÷5=5 people to skip, 25+5=30, which is a multiple of 5, so the number reported by the 25th person is 30, and the next number is 31;

(2) b is negative and the absolute value is the smallest, then

Buy buy Mai+Mai a-b+ Mai b-c+ Mai c-a = A+(A+B)+(B+C)+(C-A) = A+

③ Three situations of the first air separation:

1. When x

Second, when-1 < x < 0, fill in 1- 丨 x 丨;

3. when x > 0, fill in x+1;

The second blank is -3 or 1.

4 choose B.

⑤ If it is 20 1 1, 20 10÷ 1 = 2011,the explanation is: 2010 ÷/kloc-

If it is 20 10, both ends of the line segment are not on the hour, and there are 1 whole points in the middle of each unit length, then it is 2010/= 2010.

⑥ m-2 ⑥+⑥ m-5 ⑥ represents the sum of the distances from m to -2 and from m to -5. Minimize their sum, then m is between -2 and -5, so the minimum distance is the distance between -2 and -5, which is equal to 3.

⑦ a+5 ⑦ on the number axis is the sum of the distance from point A to the origin and the distance from point 5 to the origin.