1. The product of a rational number and its inverse ().

(a) It is a positive number; (b) It is negative.

(c) not more than 0 (D) not less than 0.

2. If the product of two rational numbers is less than zero and the sum is greater than zero, then these two rational numbers ().

(a) The sign is opposite; (b) The signs are opposite and the absolute values are equal.

(c) The sign is opposite, and the absolute value of negative numbers is large; (d) The sign is opposite, and the absolute value of positive numbers is large.

3. On the number axis, move point A to the left by 2 unit lengths to reach point B, and then move it to the right by 5 unit lengths to reach point C. If the number represented by point C is 1, the number represented by point A is ().

A.7 B.3 C.-3 D.-2

4. As shown in the figure, two points on the number axis correspond to real numbers respectively.

The following conclusion is correct ()

A.B.

C.D.

5. The following conclusion is correct ()

A.-A must be negative B, -| A | must be negative.

C |a| must be a positive number d, and | a | must be a negative number.

6. It is known that A and B are rational numbers that are not 0. When a and B are represented by points on the number axis, they should be ().

A B C D

7. The reciprocal of a number is greater than itself, and this number is ().

A. positive number B. negative number C. 0 D. non-negative number

8, the following relationship must be established is ()

A. if | a | = | b|, then a = B.

B. if | a | = a, then a > 0.

C. if | a |+a = 0, then a≤0.

D. if a>b, then | a | >| b |.

9. The sum of all integers whose absolute value is greater than 2 and less than 5 is ()

a7 B- 7 c . 0d . 5

/kloc-the reciprocal of 0/0. Yes ()

A. The second century BC

II. Fill in the blanks (every space 1 minute, *** 16)

1. There is an integer whose absolute value is greater than 1 but not greater than 3, and its sum is. If the distance from the point of the number A to the origin is 2, then a+|-a|=.

2.

3. The smallest positive integer is _ _ _ _ _; The rational number with the smallest absolute value is _ _ _ _ _. The number whose absolute value is equal to 3 is _ _ _ _ _.

The number whose absolute value is equal to itself is

4.= 。

5. As shown in the figure, the number represented by point A on the number axis is a, so the distance from point A to the origin is.

6.=_________。

7. If ∣a-4∣=4-a, then a _ _ _ _ 0. If, then A is _ _ _ _ _

8. The reciprocal of π-3.14 is _ _ _ _ _. The inverse of a-b is _ _ _ _ _ _ _. The reciprocal of a+b is _ _ _ _ _.

Three. Calculation questions (4 points for each question, ***36 points)

1)25.3+(-7.3)+(- 13.7)+7.3

Step 4 solve the problem

1. Represents the following numbers on the number axis: the absolute value is negative 2.5 and the absolute value is positive 3. (4 points)

2. The rational number and the corresponding points on the number axis are as follows: (6 points)

(1), on the number axis; (2) Try to connect the five numbers, 0, 0, and with a ">" sign from the largest to the smallest.