First, multiple choice questions

1. There are () integers * * * greater than–3.5 and less than 2.5.

a6 b . 5 c . 4d . 3

2. If the reciprocal of a number is greater than itself, then the number is ().

A, positive number b, negative number

C, integer d, rational number not equal to zero.

3. In rational numbers, the number whose absolute value equals itself is ().

A.1b.2c.3d. Infinite.

4. It is known that point A and point B are on the same number axis, and point A represents a number. It is also known that point B and point A are 5 apart.

On the unit length, the number represented by point B is ()

A. 3 B- 7 c. 3 or -7 D.3 or 7

5. The following statement is true ()

A. 1 is the smallest natural number. B. The number whose square equals itself is only 1.

The number with the smallest absolute value of c is 0 d. The number whose reciprocal is equal to itself is only 1.

6. The following correct formula is ()

A.B. C. D。

7. The following calculation is correct ()

A.-22 =-4b .-(-2)2 = 4c .(-3)2 = 6d .(- 1)3 = 1

8. If the product of two rational numbers is positive and the sum is positive, then these two rational numbers ().

A. the same symbol, and they are all negative numbers. B. the absolute value of positive numbers is greater than negative numbers with different symbols.

C. the same symbol, two positive numbers D. different symbols, the absolute value of negative numbers is greater than the absolute value of positive numbers.

9. The deformation of the following exchange addend position, the correct is ().

A.B.

C.D.

10. The following calculation result is equal to 3 ().

A.B. C. D。

The altitudes of 1 1.A, b and c are 20m,-15m and-10m respectively, so the highest point is higher than the lowest point ().

10 meter

12. The following is Xiaohua's math homework. The correct one is ().

① ; ② ; ③ ; ④

A.①② B.①③ C.①④ D.②④

Second, fill in the blanks

1. It is negative and positive in the numbers -8, +4.3,-2, 0, 50,-and 3.

The reciprocal of 2.-3- is.

3. Relative dimensions:-. (fill in ">" or "

4. The radix in (-3.2) 3 is, and the sign of the result of power is _ _ _ _ _.

5. Given the sum of two numbers, the sum of antonyms of these two numbers is.

6. If known, then the formula.

7. Xiaoming accidentally drops the ink on the number axis. According to the values in the figure, the sum of the integers covered by the ink is determined to be.

–6 –4 –3 2 - 1 0 1 2 3 4 5 6

8. Write three rational numbers to satisfy them: ① is a negative number; ② is an integer; ③ divisible by 2, 3 and 5. 、 、 。

9. if A < 0 and B < 0, a+b 0 (fill in ">" or "

10. Add-12 to a number to get -5, so this number is.

Third, the calculation problem

33+(-32)+7-(-3) -(+ )+(- )

(-8 1)÷2 ×(- )÷(- 16)