The distribution problem of the first volume of mathematics problem solving in junior one.

3.( 1)5x^4+3x^2y- 10-3x^2y+x^4- 1=6x- 1 1

(2)p^2+3pq+6-8p^2+pq=-7p^2+4pq+6

(3)(7y-3z)-(8y-5z)=-y+2z

(4)-(a^5-6b)-(-7+3b)=-a^5+6b+7-3b=-a^5+3b+7

(5)2(2a^2+9b)+3(-5a^2-4b)=4a^2+9b- 15a^2-4b=- 1 1a^2+5b

(6)-3(2x^2-xy)+4(x^2+xy-6)=-6x^2+3xy+4x^2+4xy-24=-2x^2+7xy-24

4.( 1) 9x+6x2-3 (x-2/3x2), where x=-2.

9x+6x^2-3x+ 1 1/3x^2=6x+29/3x^2=6*(-2)+29/3*(-2)=- 12-58/3=-94/3

(2)1/4 (-4x2+2x-8)-(1/2x-1), where x= 1/2.

-x^2+ 1/2x-2- 1/2x+ 1=- 1/2^2+ 1/4-2- 1/4+ 1= 1/4- 1=-3/4

(3) (5a 2-3b 2)+(a 2+b 2)-(5a 2+3b 2), where a =- 1 and b = 1.

5a^2-3b^2+a^2+b^2-5a^2-3b^2=5-3+ 1+ 1-5-3=-6+2=-4

(4) 2 (A2B+AB 2)-2 (A2B-1)-2AB 2-2, where a =-2 and b = 2.

2a^2*2b+2ab^2-2a^2*2b*2-2ab^2-2=8*4-4*4-8*4*2+4*4-2=- 18

Supplementary answer:

First, multiple-choice questions (4 points for each question, ***40 points)

The reciprocal of 1.3 is

a.-3

3rd century BC

2. Calculation: 3+8-9+(-2)= 1

a.22

B.-22 degrees Celsius

3. The smallest integer is

a. 1 b.0 c.- 1

D. does not exist

4. If -m=2008, then =

A.-2008

C.2008 or -2008 d.|-2008|

5. On the number axis, the following statement is incorrect.

A. The absolute values of two rational median numbers are greater than the origin.

B. The larger of the two rational numbers is on the right.

C. Of the two rational numbers, the larger one is far from the origin.

D of two negative rational numbers, the larger one is close to the origin.

6. The following statement is incorrect.

A.0 is neither correct nor responsible.

B. 1 is the number with the smallest absolute value.

C. the rational number is either an integer or the absolute value of the fraction d.0 is 0.

The antonym of is

A. 2007 BC

8. The sum of all integers with absolute values greater than 3 and less than 5 is

a.8 b.4 c.0 d.-8

9. The reciprocal of a rational number is greater than itself. This number is

A. negative rational number B. zero C. positive rational number

D. impossible to exist

10. If -x is not a positive number, then x

A.this is a negative number. This is not a positive number.

C. is a positive number D is not negative.

Two. Fill in the blanks (3 points for each question, *** 15 points)

1 1. There are many quantities with opposite meanings in life. Please list two pairs of quantities with opposite meanings and express them with positive and negative numbers.

12. Calculation: 12+= 0.

13.2007 The highest temperature in Chongqing on a certain day was 170c, and the lowest temperature was -50c, so the maximum temperature difference on that day was 0c.

14. If the rational number n is negative, then the point representing n on the number axis is on the edge of the origin, and the distance from the origin is one unit length.

15. Please carefully observe the following column number and think about its changing law: ... No.2008 is; If the numbers in this column are arranged infinitely, they will get closer and closer to the numbers.

Iii. Answering questions (***45 points)

16.(***8 points) Please classify it carefully and fill in the following numbers in the corresponding circles representing the set:

,-36,2007, -(-2008), -|-2|, 0 |-0.25|, the reciprocal of 3, 500222199403086127.

17.(***9 points) Please draw a number axis, indicate the following numbers on the number axis, and use these numbers as "

+3,-3.5,- , ,-5, , ,6

18.(***9 points) The "Three Good Cups" basketball games in Qijiang County are just around the corner. After the start of school, the basketball team of Ganshui Middle School should select new players to enrich the original basketball team. According to the requirements of the head coach, the standard height of the players is 165cm. At present, there are five contestants. After physical examination, their heights were recorded as -6cm, -4cm,+1cm, +2cm, -8cm, respectively (those above the standard are positive, those below the standard are negative). If the actual height of the selected players is 160 cm- 170 cm, what is the average height of these five students? How many of these five students can be selected for the basketball team of this school?

19.(***9 points) Careless students drew a number axis when doing the problem. There is a point A on the number axis, which means -2. Due to carelessness, the origin on the number axis was marked in the wrong position, so that point A just fell on the opposite position of -2. Please help the careless students draw this number axis correctly with this number axis. In which direction should the origin move?

20.(* * * * 10) In the activity class, six students made six ping-pong balls with plasticine. The diameter can have an error of 0.02 mm, and the number of millimeters exceeding the specified diameter is positive, and the number of insufficient ones is negative. The inspection results are as follows:

Li Ming, Zhang Bing, Wang Min, Yoga Yu, Zhao Ping and Cai Wei, these students play table tennis.

Test result +0.03 1

-0.0 17 +0.023 -0.02 1 +0.022 -0.0 1 1

Please point out which students' table tennis meets the requirements.

⑵ Point out which student plays table tennis best and meets the requirements? Which classmate did poorly?

Please rank the table tennis qualities of six students from the best to the worst.

(4) Use the absolute value knowledge to explain the above problems.

Answer: In the autumn of 2007, "1+ 1" exercises in middle schools refer to the answers of seventh grade mathematics (new edition of PEP).

Unit test question 1

First, multiple choice questions

Title 1 2 3 4

5 6 7 8 9 10