Precautions:

1. This test paper ***8 pages, three major questions, full score 120. Please answer directly with a pen or ballpoint pen.

2. Fill in the items in the sealed line clearly before answering the questions.

The total score of the first, second and third questions

Select16171819 202122 23.

mark

First, multiple-choice questions (3 points for each small question, *** 18 points)

There are four answers to the following questions, only one of which is correct. Fill in the brackets after the question with the code letters of the correct answer.

The reciprocal of 1 Yes ()

A.B. C. D。

2. As shown in the figure, move the equilateral △ABC with a side length of 2 units to the right along BC by 1 unit to get △DEF, and the perimeter of the quadrilateral ABFD is ().

A.6 B.8

c 10d 12

In order to let residents have more places for leisure and entertainment, the government has built several new squares. When paving the floor, the masters are going to choose the same regular polygon floor tile. There are several regular polygon floor tiles in the following shapes, of which () is not suitable for plane mosaic.

A. regular triangle B. square C. regular pentagon D. regular hexagon

4. In the plane rectangular coordinate system, the position of the point is in ().

A. first quadrant B. second quadrant C. third quadrant D. fourth quadrant

5. In a set of data 3, 4, 4, 6, 8, the following statement is true ()

A. the average is less than the median B. Average equals median.

C. the average is greater than the median D. Average equals mode.

6. It is estimated that the operation result should be in ().

A.6 to 7, B.7 to 8, C.8 to 9, D.9 to 10.

Fill in the blanks (3 points for each small question, 27 points for * * *)

7. To be meaningful in the real number range, the following conditions should be met.

8. A polygon is a polygon if the sum of its internal angles is equal to.

9. With the elevation, the oxygen content in the air is directly proportional to the atmospheric pressure. If yes, please write the functional relationship with.

10. As shown in the figure, the real number corresponding to each point on the number axis is,

Then the distance between them is. (expressed by inclusion)

1 1. A rhombus with a side length of 5cm and a diagonal length of 6cm, then the length of the other diagonal is.

12. Write a letter satisfying 14.