2. Express the value of the integer x on the number axis, and click: you can find the integer solution with the number axis.

3. The absolute value, reciprocal and reciprocal of a =-2 are 2, 2,-1/2 respectively; The absolute value, reciprocal and reciprocal of b=-2/3 are 2/3, 2/3 and-3/2 respectively; The absolute value, reciprocal and reciprocal of c=5.5 are: 5.5, -5.5, 2/ 1 1 respectively.

4、0, 1

5、① 100; ②-38; ③-70; ④- 1 1; ⑤96; ⑥-9; ⑦- 1/2; ⑧75/2; ⑨-9; ⑩7.8; 1 1、5.3; 12、-289; 13、22; 14、- 16。

6、①≈245.6; ②≈ 176; ③≈ 12.00④≈6.54。

7. Victory is+,negative is-,and negative is -2.

8、79. 1。

9. First it was extended by 0.09mm, then it was shortened by 0. 1 1mm, and the final length was extended by -0.02mm compared with the original length.

10, 1.4960× 10 to the eighth power kilometer.

1 1, ① when a= 1/2, the square of a is 1/4 and the cube of a is 1/8, so a > the square of a > the cube of a (0 < a b > the cube of b (-1 < b < 0).

12, ① wrong, the inverse of 0 is 0; (2) Yes, the signs of the same even power of any two mutually opposite numbers are opposite, and their absolute values are equal; ③ No, for positive numbers and negative numbers, positive numbers are greater than negative numbers, and the reciprocal of positive numbers is still greater than the reciprocal of negative numbers.

After playing for a long time, are you satisfied with the answer?