Chapter 1 Rational Numbers

First, multiple-choice questions (4 points × 10 = 40 points)

The absolute value of 1 and 2008 is ()

A, 2008b, 208c, 208d,

2, the following calculation is correct ()

a 、-2+ 1=-3 B 、-5-2=-3 C 、- D、

In recent years, the development of education in Anhui Province has been accelerated. According to the statistical data at the end of 2005, there are about 3.34 million students in ordinary junior high schools, and 3.34 million students are expressed as () by scientific notation.

A, 0.334× person B, 33.4× person C, 3.34× person D and 3.34× person.

4, the opposite of each other in the following logarithm is ()

A, -(-8) and +(+8) b, -(+8) and +|-8 |

C, -d, -|-8 | and +(-8)

5. The result of calculating (-1) ÷ (-5) × is ().

a 、- 1 B、 1 C、D 、-25

6, the following statement, the correct is ()

A has the smallest rational number B and the smallest negative number.

C has a number d with the smallest absolute value and a positive number with the smallest absolute value.

7. Xiaoming does morning exercises on a north-south road. The operation records are as follows: (Beizheng, unit: m): 500, -400,-700,800. Xiao Ming's total running distance is ().

A, 800m b, 200m c, 2400m d, 200m

8, known | x | = 2, y = 9, x y.