Name: Category:

First, multiple-choice questions (3 points for each question, ***30 points)

1, if the east is positive, then -8m is ().

A, walk 8m b to the east, 8m c to the south, 8m d to the west and 8m to the north.

2. The algebraic expression (a-b)2/c means ()

The square of the difference between a and b is divided by c B, and the difference between a and b is divided by C.

The square of the difference between c, a and b divided by c D, the difference between the squares of a and b divided by C.

3, zero is ()

A, positive number b, odd number c, negative number d, even number

4. Add a "-"sign before the number to get a ().

A, negative number b, arbitrary number c, reciprocal d of original number, non-positive number

5. If ab=0, then there must be ().

a、a=b=0

At least one of C A and B is 0 D A, and at least one of B is 0.

6, the following figures are negative ().

a 、-(- 1/2) B -|- 1/3|

c-[+(- 1/5)]D |- 1/6 |

7, the following statement is correct ()

(1) The sum of a number and its absolute value cannot be negative. (2) A number subtracts its inverse, and their difference is twice that of the original number; (3) Zero minus a number must be negative. (4) The positive number of burden reduction must be negative. (5) rational number addition and subtraction, the result must still be rational number.

a，2 B，3 C，4 D，5。

8, the following figures are ()

a、—(-0.2)=+(+ 1/5) B 、(-3)+(+3)=6

c 、+(- 1)=-(- 1)D 、-[+(-7)]=+[-(+7)]

9, the following statement, the correct is ()

A has a minimum rational number b and a maximum negative integer.

C has the largest negative integer d and the smallest integer.

10. If the quotient of the absolute value of a number divided by a is-1, then a must be ().

A,-1 B, 1 or-1 C, negative number d, positive number.

Second, fill in the blanks. (3 points for each question, ***30 points)

1 1. There are students A, B and C in the classroom, and then there are students () in the classroom.

12. It is known that the product of two numbers is 36. If a number is m, the sum of these two numbers is ().

13. When x= (), the value of algebraic expression (x-4)/3 is equal to 0.

14, after the temperature drops from a. C to t.C, it is ().

15, let a be x and b be y, then "the product of a and b minus the difference between a and b" can be expressed as ().

16, if a>0, then | a |= ()

17, 129340000 is expressed as () in scientific notation, and the significant figure of 89765 is (). If it is retained to two significant figures, it is ().

18, the number 5 less than -3 is ()

Third, the calculation problem. (4 points for each question, * * * 16 points)

( 19) {0.85-[ 12+4(3- 10)]}/5 (20)[(-3)3-(-5)3]/[(-3)-(-5)]

(2 1)(-2)3*5-(-0.28)/(-2)2 (22)( 1/4+ 1/6- 1/2)*48

Fourth, answer questions. (6 points for each question, ***24 points)

23. It is known that | a |=5, |b| =3, and the symbols of a and b are different. Find the value of algebraic formula (a+b)(a-b).

24. On the number axis, all integers whose absolute values are not greater than 5 are represented.

25. The weights of five bags of wheat are 183kg, 176kg, 185kg, 178kg, 18 1kg respectively. The excess kilograms are positive, and the shortage kilograms are negative. So how many kilograms do these five bags of wheat exceed or fall short of the standard weight? What is the total weight of these five bags of wheat?

26. During the holidays, the school organizes students to participate in work-study programs for a period of time, and each student receives financial support from 15 yuan. During the activity, some students bought a meal, and the meal fee was deducted 15 yuan. The actual meal fees and amounts received by students are as follows:

(1) Write the formula of c with n (a natural number with n less than or equal to 25).

(2) Calculate what C is when n=6.

The number of meals n The meals are as follows (yuan, money, c (yuan

1.60 yuan 15-0.60= 14.4.

2 1.20 yuan15-1.20 =13.80.

3 1.80 yuan15-1.80 =13.20.

4 2.40 yuan 15-2.40= 12.60

……… ……… ………

Fourth, additional questions. (20 points)

1, a.b is reciprocal, c and d are reciprocal, |m|=3. Find the value of m+cd-(a+b)/(a+b+c).

Respondent: Du Sipan-Recruitment Level 1 2009-1-1211:00.

The title is123455678911112.

answer

1. In the figure below, ∠ 1 and ∠2 are opposite to each other:

2. As shown in figure 1, the straight line l 1 and l2 are cut by L, and the following reasoning process is correct:

A. because ∠ 1 and ∠2 are complementary, l 1‖l2.

B if ∠ 2 = ∠ 3, then L 1 ∠ L2.

C. if ∠ 1 = ∠ 2, then l 1 ∠ L2.

D if ∠ 1 = ∠ 3, then l 1 ∠ L2.

3. The four angles formed by the intersection of two straight lines meet one of the following conditions respectively, and the condition that the two straight lines cannot be judged to be perpendicular is:

A, two pairs of vertex angles are equal, and b, a pair of vertex angles are complementary.

C, a pair of adjacent complementary angles is equal to d, and three angles are equal.

4, in the plane rectangular coordinate system, point p (-3, 2005) in:

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

5. Given a given point A (2, 1), if the intersection point A is perpendicular to the X axis and the vertical foot is C, the coordinates of point C are

A.2 B.(2，0) C.(0， 1) D.( 1，0)

6. Known points A (- 1, 0), B (1, 1), C (0 0,3), D (- 1, 2), E (0, 1), F.

1。

7. In the plane rectangular coordinate system, line segment A'B' is translated from line segment AB. Assuming that the corresponding point of A'(3-2, 1) is A'(3,4) and the corresponding point of B' (4,0), the coordinates of B are:

A.(9，3) B.(- 1，-3) C.(3，-3) D.(-3，- 1)

8, with the following groups of length of line segments as the edge, can form a triangle is:

A.7cm，5cm， 12cm B.6cm，8cm， 15cm

4 cm long, 6 cm wide, 5 cm high, 8 cm wide, 4 cm high and 3 cm high.

9. As shown in Figure 2, assuming ∠ b = ∠ c, the relationship between ∠ADC and ∠AEB is as follows:

a、∠ADC>∠AEB B、∠ADC